I saw this video a while back and thought it was awesome. It's a playable mod for Crysis which has a working DeLorean time machine. Now, I've never actually played Crysis myself, not even the demo, due to my pc limitations. I understand that it has a type of map phasing technology and.. well I think the video can give you a better idea of what it can do than I can put into words. it's just awesome.
You can download the mod and get some more information at the following web link.
Crytek's Official Modding Portal | Crymod Downloads