What On Earth?

A massive tsunami hundreds of feet high that never touches land; a secret underground base in China; an image from space may have revealed the location of the Garden of Eden.

Weird barren rings in the Namib Desert, an island the size of Manhattan that vanishes without trace and a lost city in the heart of the Amazonian jungle.

First seen from space in 1965, the Eye of the Sahara is a beautiful 25-mile structure, but how it formed remains a mystery.

NASA astronaut Mike Barratt describes photographing a strange ring in the ice on the world's oldest lake from the International Space Station.

A possible smoke screen over North Korea worries military analysts while an amateur archaeologist makes an extraordinary discovery.

Images of Earth show cities glowing, while wilderness remains dark. Why is the Australian outback illuminated like a vast city?