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.