
Ancient Aliens
"Ancient Aliens" explores the theory that extraterrestrials have visited Earth. The Great Sphinx in Giza is the largest and most studied monolithic sculpture.

"Ancient Aliens" explores the theory that extraterrestrials have visited Earth. The Great Sphinx in Giza is the largest and most studied monolithic sculpture.

"Ancient Aliens" explores the theory that extraterrestrials have visited Earth. Hundreds of strange disks are discovered in a cave in China.

Explores the world's most fascinating, strange and inexplicable mysteries. Remarkable feats of engineering from our ancient past span the globe.

Explores the world's most fascinating, strange and inexplicable mysteries. Can today's scientific knowledge really help protect us from natural disasters?

Explores the world's most fascinating, strange and inexplicable mysteries. Many ancient artifacts challenge what we know about our ancestors' technology.

Explores the world's most fascinating, strange and inexplicable mysteries. Do some animals strike at humans for reasons beyond normal defense and hunger?

Explores the world's most fascinating, strange and inexplicable mysteries. Can new information help us better understand the strangest tales of the WWII?

Explores the world's most fascinating, strange and inexplicable mysteries. There's nothing more fascinating than a code that can't be cracked.

Explores the world's most fascinating, strange and inexplicable mysteries. Are there real-life, flesh and blood monsters living among us?

Explores the world's most fascinating, strange and inexplicable mysteries. Remarkable feats of engineering from our ancient past span the globe.

Explores the world's most fascinating, strange and inexplicable mysteries. Can today's scientific knowledge really help protect us from natural disasters?

Explores the world's most fascinating, strange and inexplicable mysteries. Many ancient artifacts challenge what we know about our ancestors' technology.

Explores the world's most fascinating, strange and inexplicable mysteries. Do some animals strike at humans for reasons beyond normal defense and hunger?

Explores the world's most fascinating, strange and inexplicable mysteries. Can new information help us better understand the strangest tales of the WWII?

Explores the world's most fascinating, strange and inexplicable mysteries. There's nothing more fascinating than a code that can't be cracked.

Explores the world's most fascinating, strange and inexplicable mysteries. Are there real-life, flesh and blood monsters living among us?

Explores the world's most fascinating, strange and inexplicable mysteries. Remarkable feats of engineering from our ancient past span the globe.

Explores the world's most fascinating, strange and inexplicable mysteries. Can today's scientific knowledge really help protect us from natural disasters?

This special explores the lengths that people on the front lines.

Could these powerful leaders be hiding the truth about UFOs from the public?