Area 51

from Roswell, the delta-flyer and much more..... There is also a secret area somewhere where and there are two new weapons hidden somewhere. It's very fun to play and probably one of the best maps around! [b]Note:[/b] Without the expansion pack you won't be able to destroy breakable objects in the game. And I can tell you, there are a lot of breakable objects!
Here's another great map by M. Kupfer who also made the Dangercity map which was rewarded with a rating of 10! This is the base from Area51. Here you will find some extraterrestial models. The UFO