A glimpse of Dreamland
Google Maps has some pretty detailed shots of Area 51.
When I first heard about the aerial photos feature in Google Maps, this is one of the first things I looked up. The photos weren't nearly as good then as they are now.
Of course there's nothing especially revealing (at least not to me) in these photos, but one thing I find interesting is the parking lots full of white cars and trucks. Whatever else goes on there (and I fall squarely on the skeptic side of that issue), it must be an incredible logistical challenge to maintain a facility big enough to need cars to get around, that requires what is obviously a pretty large staff, in a very remote location. And keep it more or less a secret.