Enemy of the State

Six breathtaking images reveal six unfathomable mysteries.

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. What on Earth? Investigates six more mysteries captured from space.

Experts are baffled by a beautiful yet mysterious formation in the Sahara.

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 since, baffling scientists.

A possible smoke screen over North Korea worries military analysts while an amateur archaeologist makes an extraordinary discovery with a satellite image -- has this image revealed not one but two forgotten pyramids in Egypt?

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?

What would happen if we got a message from space? How would we react? Scientists and sci-fi writers, with cooperation from SETI and Carl Sagan's son, Nick, unravel the impact of this world changing event, forming an intriguing hypothetical scenario

How will humans react when an alien spacecraft is on its way to Earth? Will humans learn from aliens, or become colonial subjects? Scientists and sci-fi writers, with cooperation from SETI and Carl Sagan's son, Nick, unravel the impact.

The Arrival has ended. A swarm of small spacecraft depart their huge mothership, and hover in our atmosphere. The ships open their hatches, and deposit thousands of mysterious pods on the earth’s surface. Are they a message, a gift or a weapon?

A mothership the size of Texas is hovering over Earth and we're tired of waiting. We send a rover to explore, and what we find makes us question the definition of life. On Earth, the pods multiply, making contact with them unavoidable.

Astronauts train for weightlessness and fire fighters battle forest fires.

Experts reveal how regular cars are modified to race on dangerous circuits.

The crew of a nuclear submarine reveal how they stay safe during a fire.

Massive mining machines are made to be mobile.

Investigators show how they analyze the data stored on a plane's black box.g

Turbine blades are manufactured for massive jet engines.