Outerra Pretty Pictures

Outerra is a planetary graphics engine. The specific version I played was called Anteworld. It's a 1:1 replica of the entire planet. It renders vegetation, landscapes from real world map data and some few man-made features such as roads and runways. The vegetation and terrain is rendered fractally hence the game size isn't as big as one may initially think.

It was a pretty fun experience especially from a technical perspective.