Here's a YouTube walk-through of an incredibly detailed model of Frank Lloyd Wright's legendary Kaufmann/Falling Water house built in Half Life 2. Kasperg, the creator, is a gamer with an interest in using game engines for architectural visualization, and has published his Half Life 2 maps for you to play with.
Apropos of this, Alice notes "I've had the security permissions to map the BBC's Television Centre for a while, but I haven't ever found anyone local to do it. If you're near London and a dab hand with the HL2 engine, plus you fancy mapping out the Blue Peter garden and other such luminous landmarks, drop me a line…"
(via Wonderland)