Just down a search on the above and a few of the Websites have been blocked, this place exists and the American Goverment keep trying to cover it up. Mr Bush we are not stupid. http://skepdic.com/area51.html Link above
It is there but is blurred out. There is a book called Above Top Secret, which is fascinating, exposes the whole thing.
Neither do French nuclear submarine bases. Seems to be standard military practice to censor such images.
The nuclear weapons facilty at Aldermaston has been on and off of the Ordinance Survey maps for years apparently.
Love the bit from that link about the US Govt making a treaty with aliens allowing them to fly over Area 51 as long as the US is allowed to experiment on them and try to duplicate the alien craft!
i found a great site investigating them, sadly the url is on my rents computer so i will find it out later in the week! its got google earth links to all the interesting places concerned with Area 51 and alot of UK sites! very interesting!