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As far as the visualisation of the cities is concerned, VRML (Virtual Reality Markup Language) offer the possibilities to interact with three-dimensional information and navigate inside virtual environments. VRML works as a plug-in on web browsers and it is free of download.
A list of some examples of virtual cities that are free to navigate is provided below:
Virtual City (UK)
http://www.locus.org.uk/Virtual%20City/virtual_city.html
Virtual London (UK)
http://www.casa.ucl.ac.uk/projects/projectDetail.asp?ID=55
Virtual Medieval Castles (UK)
http://www.timeref.com/3dindex.htm
VRGlasgow (Scotland)
http://www.vrglasgow.co.uk/
Virtual St. Pierre church (France)
http://christler.cedric.free.fr/stpierre/
Virtual Toronto (Kanada)
http://www.intoronto.com/
Virtual Xanthi (Greece)
http://www.67100.gr/
Virtual Ljubljana (Slovenia)
http://www.ljubljana.si/en/ljubljana/virtual_ljubljana/default.html