This is a subject that has always intrigued me. What do you really think goes on there? Could it be Alien activity? Doubt it. Probably an aircraft design and testing facility as Boeing and Lockeed have registered hangars there. Here are a couple of cool links ive found.........
http://www.lazygranch.com/janair.htm The planes that take the workers of Groom Lake (Area 51) from the Las Vegas aiport to groom lake.
http://www.lazygranch.com/fg.htm
http://www.rumormillnews.com/cgi-bin...cgi?read=15817
http://www.ufomind.com/area51/org/se.../gallery.shtml Links about the security force at Groom Lake.
http://www.dreamlandresort.com/ Just a good all around site about Groom Lake