I have seen a few very brief videos that present 3d walk through tours of the beis hamikdash (usually the 2nd bayis). I would like to know if there are any extensive, thorough such videos available for free online.
There is a YouTube video demonstrating a Minecraft project of the first Bet Hamikdash, as well as of the Mishkan, as a project by Rabbi Swigard's class in Harkam Hillel Hebrew Academy, 2012.
I think this is what you're looking for: http://jerusalem.com/tour/jewish_temple_3D/web
Moshiach.com has an interactive walk-through of (what I'm pretty sure is) the Third Temple.
It doesn't seem to work properly on Chrome, but works fine on Firefox.