Can only 6 houses be an example of town planning??
They are a bit "more" than "6 houses" - rather "6 estates". The statement quoted is found in the introductory description rather than in the Statement of OUV. So there is a need to define the "Rules".
If you make such list then it would be like a monster. It will include from Moenjodaro(3rd millennium b.c.) to brasilia(1960) and it would be impossible to create such a list.
Perhaps not such a "monster" or so "impossible"! I have just trawled through the 196 sites whose OUV Statements are up for consideration this year. They represent, presumably reasonably randomly in respect of this issue, a bit over 20% of all sites. I found that 8 of them (including 1 we have already included specify "Town" or "Urban Planning" in their OUV statement so that could mean around 35-40 across all WHS. In response to a query above - this includes RigaPing Yao
Criterion (ii): The townscape of Ancient City of Ping Yao excellently reflects the evolution of architectural styles and town planning
in Imperial China over five centuries with contributions from different ethnicities and other parts of China.Fatehpur Sikri
Criterion (ii): The construction of Fatehpur Sikri exercised a definite influence on the evolution of Mughal town planning
, namely, Shahjahanabad.Cuenca
Critère (ii): Cuenca illustre la parfaite implantation des principes de planification urbaine
de la Renaissance aux Amériques.Antigua
Criterion (iii): Antigua Guatemala is one the earliest and outstanding examples of city planning
in Latin America in which the basic grid plan, dating from 1543, has been maintained. Its religious, private and government buildings are outstanding evidences of Spanish colonial architecture in Antigua.Morelia
Critère (ii): Le Centre historique de Morelia est un exemple exceptionnel de planification urbaine
qui associe les idées de la Renaissance espagnole à l'expérience méso-américaine.Oaxaca
Criterion (i): Oaxaca was the first town laid out in the New Spain during the XVI century with square blocks of 100 yards per side and planned from a central square. The icons of economic, political and religious powers were built around this central place, giving the city dynamism and contributing to universal urbanism. The grid layout of the city of Oaxaca is a unique example of urban planning
in New Spain in the sixteenth centuryRiga
Criterion (i): The medieval and later-period urban planning
structure of the Historic Centre of Riga, as well as the quantity and quality of Art Nouveau architecture, which is unparalleled anywhere in the world, and the 19th century wooden architecture make it of Outstanding Universal Value. The Historic Centre of Riga has the finest
concentration of Art Nouveau architecture in the world.Edinburgh
was a bit "ambiguous" but could "get in" if we stretched the allowable wording somewhat "Criterion iv........Andrássy Avenue (1872–1885) and the Millenary Underground Railway (1893 – 1896) are representative examples of the implementation of planning solutions
associated with the latest technical facilities of the day to meet the requirements of an emerging modern society"
- it doesn't yet have a statement of OUV and isn't included in this year's additions. The UNESCO "Brief description" states "The ruins of the huge city of Moenjodaro – built entirely of unbaked brick in the 3rd millennium B.C. – lie in the Indus valley. The acropolis, set on high embankments, the ramparts, and the lower town, which is laid out according to strict rules, provide evidence of an early system of [i]town planning