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Underground Aliens Emerge Across the Globe (S2, E4) | Ancient Aliens | Full Episode

Underground Aliens Emerge Across the Globe (S2, E4) | Ancient Aliens | Full Episode

If extraterrestrials influenced human history, can evidence of their existence be found in hidden tunnels and caverns around the world? In Season 2, Episode 4, "Underground Aliens." Stay up to date on all of your favorite shows on The HISTORY Channel website at http://history.com/schedule #AncientAliens Subscribe for more from Ancient Aliens ...

230.6K views3 weeks ago

The Anunnaki’s Secret Underground Cities (S19, E3) | Ancient Aliens | Full Episode

The Anunnaki’s Secret Underground Cities (S19, E3) | Ancient Aliens | Full Episod

Evidence of Early Alien Contact with Earth | Ancient Aliens (S1, E99) | Full Episode | History

Evidence of Early Alien Contact with Earth | Ancient Aliens (S1, E99) | Full

Ancient Aliens Episodes

The Top Ten Alien Petroglyphs (S19, E20) | Ancient Aliens | Full Episode

The Top Ten Alien Petroglyphs (S19, E20) | Ancient Aliens | Full Episode

64.5K views1 month ago

Forbidden Files of Extraterrestrial Contact (S1, E3) | Ancient Aliens | Full Episode

Forbidden Files of Extraterrestrial Contact (S1, E3) | Ancient Aliens | Full Episode

195K views1 month ago

UFOs and Vanishing Jets (S19, E9) | Ancient Aliens | Full Episode

UFOs and Vanishing Jets (S19, E9) | Ancient Aliens | Full Episode

134.7K views3 months ago

Top videos

Mysterious Places (S2, E1) | Ancient Aliens | Full Episode

Mysterious Places (S2, E1) | Ancient Aliens | Full Episode

120.3K views4 weeks ago

Ancient Civilizations Destroyed by Catastrophes (S4, E4) | Ancient Aliens | Full Episode

Ancient Civilizations Destroyed by Catastrophes (S4, E4) | Ancient Aliens | Full Episode

42.2K views2 months ago

SHOCKING UFO MYSTERIES OF 2025 | Ancient Aliens *Full Episode Marathon*

SHOCKING UFO MYSTERIES OF 2025 | Ancient Aliens *Full Episode Marathon*

911.5K views6 months ago

Mysterious Places (S2, E1) | Ancient Aliens | Full Episode

Mysterious Places (S2, E1) | Ancient Aliens | Full Episode

120.3K views4 weeks ago

Ancient Civilizations Destroyed by Catastrophes (S4, E4) | Ancient Aliens | Full Episode

Ancient Civilizations Destroyed by Catastrophes (S4, E4) | Ancient Aliens | Full Episode

42.2K views2 months ago

SHOCKING UFO MYSTERIES OF 2025 | Ancient Aliens *Full Episode Marathon*

SHOCKING UFO MYSTERIES OF 2025 | Ancient Aliens *Full Episode Marathon*

911.5K views6 months ago

The Anunnaki’s Secret Underground Cities (S19, E3) | Ancient Aliens | Full Episode

The Anunnaki’s Secret Underground Cities (S19, E3) | Ancient Aliens | Full Episode

320.5K views3 months ago

Evidence of Early Alien Contact with Earth | Ancient Aliens (S1, E99) | Full Episode | History

Evidence of Early Alien Contact with Earth | Ancient Aliens (S1, E99) | Full Episode | History

3.4M viewsNov 16, 2024

Secrets of Mars and Ancient Visitors *Marathon* | Ancient Aliens

Secrets of Mars and Ancient Visitors *Marathon* | Ancient Aliens

223.7K views1 month ago

Mysteries Beyond Earth and Time *Marathon* | Ancient Aliens | History

Mysteries Beyond Earth and Time *Marathon* | Ancient Aliens | History

312.7K views7 months ago

The Mystery of Alien Travel Through History | Ancient Aliens

1.2M views2 months ago

Ancient Technology Beyond Its Time (S2, E6) | Ancient Aliens | Full Episode | History

309.3K views7 months ago

Inside the Mystery of the Greys | Ancient Aliens

1.5M views4 months ago

Lost Technologies of Ancient Civilizations | Ancient Aliens

455.8K views1 month ago

Ancient Mysteries EXPOSED: Mummies, Pyramids & Lost Structures Revealed! *Marathon* | Ancient Aliens

269.2K views11 months ago

Heavenly Visitors or Extraterrestrial Beings? | Ancient Aliens

54.9K views6 months ago

Forbidden Caves Inside Antarctic Pyramids *Marathon* | Ancient Aliens

187.3K views2 months ago

Ancient Aliens: Shocking Mysteries from Beyond *Marathon* | History

326K viewsApr 21, 2025

The Mystery of Earth’s Sacred Places | Ancient Aliens

107.2K views6 months ago

Explaining Advanced Ancient Egyptian Technologies | Ancient Aliens | Compilation | History

5.7M viewsMay 13, 2025

Biggest Mysteries of Egypt (Part 2) | Ancient Aliens | History

1.4M views11 months ago

UFOs at Nuclear Sites? | Ancient Aliens

203K views3 months ago

The Truth About Alien Disclosure | Ancient Aliens

376.4K views1 month ago

2025’s Biggest Alien Discoveries (Part 2) | Ancient Aliens

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Lost Civilizations Beyond History | Ancient Aliens

633K views3 months ago

Giant Stones Are More Than Meets the Eye | Ancient Aliens | History

414.9K views11 months ago

Interstellar Secrets of Ancient Civilizations | Ancient Aliens | History

7.5M viewsFeb 25, 2025

Was Magic Real in the Ancient World? | Ancient Aliens: Declassified (S2, E5) | Full Episode

2.4M viewsJan 4, 2025

Did aliens build these mega structures? | Ancient Aliens: Declassified (S1, E39) | Full Episode

1.4M views11 months ago

Craziest Alien UFO Crashes | Ancient Aliens | History

476.4K viewsMay 27, 2025

UFO Mysteries Will Shock You! *Marathon* | Ancient Aliens | History

805.2K viewsApr 14, 2025

Ancient Aliens: Possessed Geniuses or Masterminds? (S9, E4) | Full Episode | History

2M viewsMar 12, 2025

See more

Short videos

Underground Aliens Emerge Across the Globe (S2, E4) | Ancient Aliens | Full Episode

230.6K views3 weeks ago

Mysterious Places (S2, E1) | Ancient Aliens | Full Episode

120.3K views4 weeks ago

Ancient Civilizations Destroyed by Catastrophes (S4, E4) | Ancient Aliens | Full Episode

42.2K views2 months ago

SHOCKING UFO MYSTERIES OF 2025 | Ancient Aliens *Full Episode Marathon*

911.5K views6 months ago

The Anunnaki’s Secret Underground Cities (S19, E3) | Ancient Aliens | Full Episode

320.5K views3 months ago

Evidence of Early Alien Contact with Earth | Ancient Aliens (S1, E99) | Full Episode | History

3.4M viewsNov 16, 2024

Secrets of Mars and Ancient Visitors *Marathon* | Ancient Aliens

223.7K views1 month ago

Mysteries Beyond Earth and Time *Marathon* | Ancient Aliens | History

312.7K views7 months ago

The Mystery of Alien Travel Through History | Ancient Aliens

1.2M views2 months ago

Ancient Technology Beyond Its Time (S2, E6) | Ancient Aliens | Full Episode | History

309.3K views7 months ago

Inside the Mystery of the Greys | Ancient Aliens

1.5M views4 months ago

Lost Technologies of Ancient Civilizations | Ancient Aliens

455.8K views1 month ago

Ancient Mysteries EXPOSED: Mummies, Pyramids & Lost Structures Revealed!

269.2K views11 months ago

Heavenly Visitors or Extraterrestrial Beings? | Ancient Aliens

54.9K views6 months ago

Forbidden Caves Inside Antarctic Pyramids *Marathon* | Ancient Aliens

187.3K views2 months ago

Ancient Aliens: Shocking Mysteries from Beyond *Marathon* | History

326K viewsApr 21, 2025

The Mystery of Earth’s Sacred Places | Ancient Aliens

107.2K views6 months ago

Explaining Advanced Ancient Egyptian Technologies | Ancient Aliens | Compilation |

5.7M viewsMay 13, 2025

Biggest Mysteries of Egypt (Part 2) | Ancient Aliens | History

1.4M views11 months ago

UFOs at Nuclear Sites? | Ancient Aliens

203K views3 months ago