Well I really have no idea to add more sites in Top 50 missing as my original proposal, Swedagon Pagoda, is already on the list. But if I have to pick more I will propose 3 sites that are currently in danger by modern development.

1) Laos - Si Phan Don, a complex of more than 4000 river islands in Mekong river. Very important site for biodiversity that maybe destroy by many dam projects in Laos and Cambodia.

2) South Korea - Incheon/Ganghwa/Songdo Tidal Wet Land, these areas of tidal wet lands are impressive in size and biodiversity but are in danger by land reclamation, bridge and dam power plant projects.

3) Myanmar/Thailand - Mergui Archipelago and Andaman coast, these areas are in danger from development in tourist industry, the once isolation of Myanmar that helped to preserve its biodiversity and unique Moken people culture are now gone.

These 3 sites are maybe not in the Top 50 but just to raise their situations for more protection

Excellent suggestions! Particularly because we should also consider the sites that are most at risk. I particularly liked Si Phan Don. Is the Korea proposal an extension to the Southwestern Coast Tidal Flats tentative nomination?

(Current TWHS)
Gochang Tidal Flats
Suncheon Tidal Flats
Muan Tidal Flats
Buan Tidal Flats
Boseong Tidal Flats
Sinan Tidal Flats

Your suggestion:
Songdo Tidal Flats
Gangwha Tidal Flats
Incheon Tidal Flats

The Ganghwa Tidal Flats may yet survive, yet I fear it is already too late for the tidal flats in Songdo and Incheon. Sadly, the vast majority of the latter have become reclaimed land.

I'm trying to think of some new ones to be honest, and trying to get outside my comfort zones: Modern and Post Modern Eras, Europe, North America. However this is where my heart lies so the three I would pick out are:

Olympic Park Munich: Specifically the whole park rather than just the stadium. It is a Gesamtkunstwerk designed for the hosting and broadcasting of the largest events in human history (Olympic games and Football World Cup) reflective of modern concepts of increased leisure activities and global communication.

Major Buildings of the Chicago School of Architecture: These exceptional pioneering structures show the development of the earliest incarnation of vertical architecture that have come to define the modern age especially the migration of peoples to the urban environment. It could easily be expanded to include other sky-scrappers in Chicago to bring vertical architecture to its rightful place on the list.

Baikonur Cosmodrome/ Kennedy Space Centre: Perhaps the defining achievement of the Modern age has been the exploration of space and it's use in defining the Modern and Post Modern periods through its use in telecommunications. These sites are the main sites associated with the major breakthroughs in space exploration.

There are the best of the best which have already either already been mentioned or are on their way to inscription: Bagan, Dzongs, Silk Route, Shwedagon Pagoda, Ur, Babylon, Okavango Delta, Chauvet Cave, Scorvegni Chapel, Grand Canal, Le Corbusier Works, Frank Lloyd Wright works, Qhapaq Ñan and probably a fair few more.

Will try and come back with some from outside my comfort zones though.

Olympic Park in Munich is already part of the Top 50 Missing. I also just realized we had the Kennedy Space Center on the Top 50 missing, just with a slightly different name. Maybe you want to add 2 more (if you have any in mind)?

There has been a lot of support for:

Chicago School of Architecture

Perhaps this is the strongest cultural candidate from the US? (That's not currently Top 50 missing)

By the way does Bojboj have any suggestions for Top 50 missing? So far we only have (1) candidate from Philippines? The Philippines are under-represented and has plenty of gaps.

Top 50 Missing Participation

We already have 13 individuals proposing sites.

Assif (Israel)
Clyde (????)
Durian (????)
Els (Netherlands)
Euloroo (Australia)
Hubert (Austria)
Jonathanf (France)
Khuft (Germany)
Kkanekahn (India)
KSTraveler (US)
Meltwaterfalls (UK)
Solivagant (UK)
Winterkjm (US)

Active members that may suggest nominations:
Alexlove74, Bojboj, Evilweevil , Joycevs,
Kanfil, Kintante, Paul, Vantcj1

Assif:

2) Agricultural Landscape of the Midwest (USA)

I find this nomination by Assif to be worthy of a nomination, however I would like to have a few aspects of this site defined.

1. What type of landscapes would be included?
2. What states would this site accompany?
3. Would this site be a serial site? If so, how would serial sites go about being chosen?

In addition, I would also nominate a NASA/aviation site. The aviation sites could accompany serial locations such as the Dayton sites, Kitty Hawk, and maybe Wichita.

I would also wonder whether or not a site like the Appalachian Trail would be successful. There is currently a movement to create an International Appalachian Trail. http://en.wikipedia.org/wiki/International_Appalachian_Trail

Homestead National Monument (Nebraska) URL
Morrow Plots (Illinois) URL
Sanborn Field and Soil Erosion Plots (Missouri) URL

I believe these are the only 3 sites that could be immediately nominated. All 3 properties have been designated as nationally significant. Probably not the most exciting WHS, but Top 50 missing? Perhaps as a gap-filler.

Mapped Location URL

Ah, got a little lost on what precisely was required as a few sites on this thread were also resubmissions and yep Chicago, Munich Olympic Park and Baikanour/ Kennedy Space Centres were all on the Top 50 missing proposals (A-M, N-Z).

A lot of the sites I would support were in the original list or are very close to inscription.

But here you go with another batch of new ones:

Spomeniks in the former Yugoslavia:
These are grand monumental sculptures built to commemorate the Second World War, now much neglected I think they are astoundingly beautiful. They show modern reflections on commemoration and are a continuation of the many monuments built in reaction to war.
I guess it could also be expanded to include other State Socialist Commemorations of the Second World War/ Great Patriotic War: Kiev, Brest,Volgograd and many many more.
I was hoping to also incorporate Sculptural Ensemble of Constantin Brâncuși at Târgu Jiu which is currently languishing unloved on the Romanian t-list but just realised that was for the First World War.

Herat, Afghanistan:
One of the oldest still existent cities in Central Asia with a sublime collection of fine Islamic buildings and a recently restored Citadel.

Benin Iya / Sungbo' s Eredo, Nigeria:
Two of the largest defensive earthworks in the world each claims to be the largest pre-colonial monument in Africa.
In reading up I see it seems to be highlighted by the work of one of Solivagant's old friends: Dr Patrick Darling :)
I was actually looking for anything associated with the magnificent Bronze Tradition/ Royal Palace in Benin but it seems the British were a little too thorough in their Punitive Expidition.

Happy New Year from Sydney folks.

For my tuppennys' worth, Cape York is one Australian site that really needs to be inscribed for a plethora of reasons.

Beyond that my personal favourite candidates are Ebla in Syria (perhaps with nearby Ain Dara) and the old and new libraries in Alexandria.

Summary (So Far..)
- NOT including previous Top 50

Tentative Sites (Candidate for Top 50 Missing)

Afghanistan - City of Herat (17/08/2004)
Botswana - Okavango Delta (27/05/2010)
China (Kyrgyzstan/Kazakhstan) - Silk Roads (28/03/2008)
China - The Grand Canal (28/03/2008)
Egypt - Alexandria, ancient remains and the new library (28/07/2003)
France, Fiji, Tonga, USA (Hawaii, American Samoa) - Rainforests of Polynesia (Transnational) 2/5 components on Tentative List
France - La Grotte ornée Chauvet-Pont d'Arc (29/06/2007)
Iraq - The Sacred Complex of Babylon (29/10/2003)
Israel - Triple-arch Gate at Dan & Sources of the Jordan (30/06/2000)
Italy - Scrovegni's Chapel (01/06/2006)
Laos - Sites Mégalithiques de la province de Xieng Khouang (25/03/1992)
Lebanon - Ensemble du site naturel de la région du Chouf avec les monuments et les sites archéologiques qui s'y trouvent (01/07/1996)
Mexico - Ring of Cenotes of Chicxulub Crater, Yucatan (11/12/2012)
Myanmar - Wooden Monasteries of Konbaung Period: Ohn Don, Sala, Pakhangyi, Pakhannge, Legaing, Sagu, Shwe-Kyaung (Mandalay) (04/10/1996)
Nigeria - Benin Iya / Sungbo' s Eredo (01/11/1995)
Papua New Guinea, Indonesia (West Papua) - Upper Sepik River Basin (06/06/2006) *Indonesia component not on tentative list
Peru (Argentina, Bolivia, Chile, Colombia, Ecuador) - Sistema Vial Andino/Qhapaq Ñan (13/08/2010)
Philippines - El Nido-Taytay Managed Resource Protected Area (16/05/2006)
South Korea - Southwestern Coast Tidal Flats (11/01/2010)
Syria - Ebla (Tell Mardikh) (08/06/1999)
United States - Petrified Forest National Park (30/01/2008)

New Suggestions (Not on Tentative List) (Candidate for Top 50 Missing)

Australia - Cape York
Croatia - Spomeniks in the Former Yugoslavia
France - Drift Passes of Rangiroa, French Polynesia
France - Forests of Southern New Caledonia
India - Chhatris (cenotaphs) of Orchha
Germany - Tempelhof Airport, Berlin
Laos - Si Phan Don Complex
Myanmar (Thailand) - Mergui Archipelago and Andaman Coast
Peru - Huaca de la Luna and Huaca del Sol
Serbia - Synagogue of Subotica
Spain - Guggenheim Museum Bilbao, Frank Gehry
Somalia - Laas Gaal
United States - Mount Rushmore
United States - Chicago School of Architecture
United States - Golden Gate Bridge
United States - Hollywood Studios & Movie Palaces
United States - Ford River Rouge Complex
United States - Agricultural Landscape of the Midwest

Europe and North America - 16
Asia and the Pacific- 13
Arab States - 4
Latin America and the Caribbean - 3
Africa - 3

Cultural: 27
Natural: 9
Mixed: 3

Original Top 50 Missing A-M URL N-Z URL

Jonathanf (Extended List) URL

Assif (Extended List) URL

Can you give me the link of previous suggestion of other members about Top 50 missing ?
There may be some common sites between my list and thiers. I will give me suggestions about natural sites later.

Religious sites-

Mecca, Medina - (ISLAM)
Sarnath,Kushinagar,Nalanda - (Buddhism)
Dilwara Temples (Mt Abu), palitana - JAINISM
Mount Gerizim
Harimandir Sahib,Nanakana Sahib - Sikhism
Varanasi,Meenakshi Temple -Hinduism

Other sites -
Scrovegni's Chapel
Chauvet
Okavango Delta
Speicherstadt
Nan Madol
Andaman
Lake Titicaca
Mont Rushmore
Frank Lloyd Wright buildings
Le Corbusier buildings
Alexandria
Band-E-Amir
Silk Road
Chandigarh
Babylon
Bagan
Qhapaq Ñan
Ephesus
BHUTAN Dzongs
Khangchendzonga National Park
knossos
Mughal Gardens in Kashmir
The Grand Canal
Golconda Fort
Neuschwanstein Castle
Ur
Panama canal
Mehrangarh

If I understand correctly, excluding previous Top 50 sites and sites already suggested, your list includes (16) new suggestions.

India
Tentative Sites
- Ancient Buddhist Site, Sarnath, Varanasi, Uttar Pradesh (03/07/1998)
- Excavated Remains at Nalanda (09/01/2009)
- Golconda Fort, Hyderbad, Andhra Pradesh (03/07/1998)
- Kangchendzonga National Park (15/03/2006)
- Mughal Gardens in Kashmir (13/12/2010)
- Sri Harimandir Sahib, Amritsar, Punjab (05/01/2004)

New Suggestions
- Mehrangarh
- Kashinagar
- Dilwara Temples (Mt. Abu)
- Nanakana Sahib
- Meenakshi Temple

Afghanistan - Band-E-Amir (08/09/2004)
Germany - Speicherstadt and Chilehaus with Kontorhaus District (20/09/1999)
Greece - The Palace of Knossos (#) (31/01/2003)

Germany - Neuschwanstein Castle
Saudi Arabia - Medina

Currently we have been selecting our (3) favorite (most deserving) sites as candidates for Top 50 missing. Is it possible for you to select your (3) favorites? However, like the extended list created by Assif and Jonathanf, we can include additional sites on your list based on popular support. I am curious about your natural site suggestions!

My three favourites will also be natural and mixed:

Forests of Southern New Caledonia (France):
Grandes Fougere http://fr.wikipedia.org/wiki/Parc_des_Grandes_Foug%C3%A8res
Riviere Bleu http://fr.wikipedia.org/wiki/Parc_provincial_de_la_Rivi%C3%A8re_Bleue
Dumbea http://www.province-sud.nc/content/le-parc-provincial-de-la-dumb%C3%A9a

Rainforests of Polynesia (transnational):
French Polynesia (France)
Te Faaiti http://www.environnement.pf/spip.php?rubrique132
Vaikivi http://www.environnement.pf/spip.php?rubrique64
Fiji - Sovi Basin (T list)
Samoa - Fagaloa Bay (T list)
Hawaii (USA) - Alakai http://en.wikipedia.org/wiki/Alakai_Wilderness_Preserve
Tonga - Eua http://www.eua-island-tonga.com/EuaForestPlantation.html

Rainforests of Papua (transnational):

PNG - Upper Sepik River Basin (T list)
West Papua (Indonesia)
Teluk Cenderawaih http://en.wikipedia.org/wiki/Teluk_Cenderawasih_National_Park
Foja Mts http://en.wikipedia.org/wiki/Foja_Mountains

I'm not sure I can add anything useful to the suggestions made here, but anyway:

- Historic University Towns of Oxford and Cambridge (there are already some university-related sites - Alcalá, Coimbra, Salamanca, Charlottesville, Mexico City & Caracas, but Oxford and Cambridge are probably the world's most famous ones and also feature unique architecture)
- Windsor Castle (o.k., it doesn't really fill a gap either, but it is so famous and has so many superlatives that I just find its absence from the list strange)
- Death Valley National Park (a superlative natural site in many respects)
- various other national parks in the U.S. that could have been inscribed long ago (Crater Lake, Denali, Haleakala)

I have examined what has been proposed by you all and will bring in my three proposals for new sites on the Top 50 Missing List. Some of the sites proposed (like the ring of cenotes on Chicxulub, Middle and Upper Sepik, and Amritsar) are already in the older list, so I will not include them. The second group of sites that are likely to be inscribed soon, even this year (Grand Canal, Silk Route, Okavango, Chauvet-Pont d'Arc) and I will skip them. I also considered the "Filling the Gaps" documents. So, the three sites are:

1) Sublime karsts (Papua-New Guinea): karstic landscapes are already represented in the list, but Nakanai range in East New Britain, the Müller Range in Southern Highlands, and Hinderburg range in Western province are some (with their associated ecosystems) of the most impressive of the world.

2)Huaca del Sol and Huaca de la Luna, Moche Culture (Peru): Surprising that such a culture, with monuments that definitively have the wow-factor that one wants in a WHS, has not even got representation on Peru's T List.

3) Though I wanted to add a natural site in Africa, I think that sites like Maasai Mara, though impressive, do not constitute such a necessity in the list. But Western african civilizations are a gap, only represented by cultures like Dahomey, and Assante. So, I will add Benin Iya / Sungbo' s Eredo (Nigeria) to the list. The remains are extensive, impressive and highly threatened.

Just missed the cut:
4)Before the Bauhaus, Garnier, Perret, Frank Lloyd Wright, Le Corbusier and Peter Behrens, there was a school of architecture that made a sincere use of material and technique (that broke with academicist rules), in a context that allowed to depart from practically zero, created new typologies of buildings, and set the ground for what came next. As an architect, I think that the most eminent gap corresponds to the Chicago School of Architecture (United States) URL