Google engineer Nelson Minar’s river map of the continental US has a number of explorable vector-based versions and fully detailed renderings on Flickr.
You can read the technical details on his blog.
Explore the map
Ser MountainGoat (knighted by George R.R. Martin) has created this amazing map of Westeros that shows the territories, houses and paths of characters by chapter or episode. Lots of spoilers however, so use with caution.
See the map »
With the Opening Ceremonies just minutes away, this interactive map of the Olympic Venues in London should come in handy.
There is also a great gallery of photos and images of the venues.
CGI IMAGE OF THE LONDON 2012 OLYMPIC STADIUM AT SUNSET
AERIAL VIEW OVER THE OLYMPIC PARK
VIEW OF THE EXCEL CENTRE AND THE NORTH GREENWICH ARENA