It's probably one of those we have in the connection Takes more than 5 days to visit
·Aldabra Atoll Only accessible by ship, cruises take 2 to 3 weeks but also often include one or two other WHS such as Vallee de Mai and Zanzibar
·Bikini Atoll visitable by private yachts, or you could join a shipwreck diving tour - at least 3 days one way from Australia
·Gough and Inaccessible Islands 22 days cruise
·Heard and McDonald Islands 25 day cruise, if it ever runs
·Henderson Island The shortest cruise calling on this Island takes 25 days; it fortunately also stops at Easter Island (a 2nd WHS within 25 days)
·Macquarie Island Combined cruise with New Zealand Sub-Antarctic Islands, 14 days
·Ogasawara Islands Ferry from Tokyo takes (at least) 25 hours, return ferry starts 3 days later, so just over 5 days round trip
·Phoenix Islands by private or chartered yachts only, or a 15 day cruise ;
·Sub-Antarctic Islands Combined cruise with Macquarie Island, 14 days;
·Wrangel Island Cruises take about 14 days for a roundtrip;
So I'd say probably Heard and McDonald
and Phoenix Islands
for difficulty to reach (Wrangel
is probably the most expensive to reach).
And then there are those that are just off-limits
·Decorated cave of Pont d'Arc Closed. A replica cave is being built.
·Gough and Inaccessible Islands Visitors are not allowed to land on Gough island. Tourists are limited to Zodiac cruises which must not approach the shore and even crew members from passing yachts may not go ashore except in the case of an "extreme emergency". (Landing is allowed on Inaccessible if authorised by the Tristan Da Cunha government and accompanied by local guides who have to travel with the ship from the main island of Tristan)
·Mount Hamiguitan Closed in 2010, may open again in 2015 (seems open
now, don't know if it covers the core zone)
·Mount Nimba It is a "strict" reserve, forbidding tourism. (wiki)
·Papahanaumokuakea Only open for specific purposes; link
·Rio Abiseo National Park "Since 1986, the park has not been open to tourism due to the fragile nature of both the natural and archaeological environment." (wiki)
·Stoclet House Privately owned, and only very few people have seen its interior.
·Sundarbans National Park Core zone is not open to tourists
·Surtsey Only open to scientists.
Some of them you can look at from the fringes, but Rio Abiseo
seems impossible and for Papahanaumokuakea
there's only hope visiting Midway Atoll.
And finally, looking at those with 0 visits from the users of this website:
1041.Heard and McDonald Islands - 0
1042.Manovo-Gounda St. Floris - 0
1043.Salonga National Park - 0
1044.Wrangel Island - 0
1045.Lakes of Ounianga - 0
1046.Sangha Trinational - 0
1047.Rock Art in the Hail Region - 0
1048.Ahwar of Southern Iraq - 0
1049.Mistaken Point - 0
1050.Ennedi Massif - 0
1051.Zuojiang Huashan Rock Art - 0
1052.Hubei Shennongjia - 0
Some are there only because they're quite new. But Heard and McDonald Islands
, Manovo-Gounda St. Floris
and Salonga National Park
seem genuinely difficult.