Parts of the world will become virtualized as time and people arise to tackle
them. If you are working on any particular location and are willing to be
listed here, please let us know.
Eventually there should be a
searchable, geographically-reference database of
modeled areas, with some similarity to the Alexandria Digital Library Project.
A good effort at organizing all known modelled cities (mostly commercial,
as of 2012) with a nice map interface is at
Worldwide Virtual City Models. There are related efforts like
Open Data Census which keeps track of
how open city data is globally; some countries include information on
physical rather than abstract data.