Go to this page...

http://www.hoap.co.uk/download.htm

and download "Research in Geomancy 1990–1994". You'll find plenty of examples there, under "The Ideal City", "The City As Built" and "The City in Ritual".

I admit I've only scratched the surface of this subject, but it seems pretty clear to me that plenty of cities have been designed on geomantic principles. Please do put me right if I've got it wrong, though.

"I'm not suggesting that the city of London was designed geomantically in the manner that I've heard Rome was, when I think about it. More that the sacred landscape/whateveryoucallit that was there before London has influenced London's development."

Which is just what Bob Trubshaw has argued about Jerusalem:

"Although the physical city of Jerusalem was never laid out on the principles of 'sacred geometry', the main christian sites give the natural topography an indelibly sacred manifestation, with Mount Sion the most auspicious of the holy mountains."

http://www.indigogroup.co.uk/edge/mountn.htm