It's amazing what you can find on Google Earth. I once downloaded it just to get some spatial coordinates, but now I use it to casually explore the world. For example, there's a huge Batman logo on a hangar of a US Air Force base in Okinawa, Japan.
And there's this monument erected deep in the desert of Niger. It's the site of the remains of UTA Flight 772, a French airliner that was blown up by terrorists in 1989. In 2007, with great difficulty, relatives of the victims traveled out to the site and built a monument. They intentionally built it to be visible from space.
These are 2 of 50 amazing finds rounded up at Twisted Sifter. You can find the rest here.