Strange aquatic mammals populating a river in Colombia, a ship marooned in a sea of sand along Namibia's notorious Skeleton Coast, a Boeing 727 jetliner hidden in a pine forest, and a unusual pattern is discovered in the Nevada desert.

Cameras capture the world from fresh and exhilarating perspectives. The planet's most puzzling structures are revealed, including ancient pathways criss-crossing Easter Island, gigantic designs carved into Asia's Eastern Steppe, and a tall pyramid rising from Antarctica's icy landscape.