Six breath-taking images, six unfathomable mysteries; from a gigantic tsunami hundreds of feet high that never hits land, to a secret underground base in China and has an image from space finally revealed the location of the Garden of Eden?
Six more mysteries captured from space are investigated, including weird, barren rings in the Namib desert, a vanishing island and a lost city in the heart of the Amazon 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. And are extraordinary clouds emanating from an island in the Indian Ocean evidence of a terrifying new weather weapon?
A possible smoke screen over North Korea worries military analysts while an amateur archaeologist makes an extraordinary discovery with the help of a satellite image; has this image revealed not one but two forgotten pyramids in Egypt?
NASA astronaut Mike Barratt describes photographing a strange ring in the ice on the world's oldest and most mysterious lake from the International Space Station. More rings on Lake Baikal have been seen, baffling scientists.
Images of Earth from space reveal an intimate portrait of human activity. Cities glow bright while the wilderness remains dark. Why then is the Australian outback lit up like a series of vast cities?