After all, it's arguably most famous for its signature "Bliss" wallpaper depicting a rolling green hill, deep blue sky and little fluffy clouds. But whatever happened to that hill? Was it actually ...

The photo you see above -- the default wallpaper for Windows XP -- is probably the most recognizable image in the world. What you probably didn't know is that it's a real photo, called Bliss ...

Microsoft purchased it in 2000. The picture known as "Bliss" soon became one of the most viewed photographs in the world when it was set as the default desktop background in Windows XP.