Season
- Season 0 2009-03-08
- Season 1 2010-04-20
- Season 2 2010-10-28
- Season 3 2011-07-28
- Season 4 2012-02-17
- Season 5 2012-12-21
- Season 6 2013-09-30
- Season 7 2014-01-24
- Season 8 2014-06-13
- Season 9 2014-10-31
- Season 10 2015-07-24
- Season 11 2016-05-06
- Season 12 2017-04-28
- Season 13 2018-04-27
- Season 14 2019-05-31
- Season 15 2020-01-25
- Season 16 2020-11-13
- Season 17 2021-08-06
- Season 18 2022-01-07
- Season 19 2023-01-06
- Season 20 2024-01-05
- Season 21 2025-02-07
Season 21 Episode
- Season 18 The Disclosure Event
- Season 18 Mystery of the Standing Stones
- Season 18 Beneath the Sacred Temples
- Season 18 The World on Alert
- Season 18 Recovering The Ark Of The Covenant
- Season 18 Secrets Of The Star Ancestors
- Season 18 Alien Air Force
- Season 18 The Shadow People
- Season 18 Decoding the Dragon Gods
- Season 18 The Time Benders
- Season 18 Ancient Aliens On Location: Incredible Structures
- Season 18 Ancient Aliens On Location: Extraordinary Encounters
- Season 18 Ancient Aliens on Location: The Alien Glyphs
- Season 18 Ancient Aliens On Location: The UFO Investigations
- Season 18 Ancient Aliens On Location: Mysterious Artifacts
- Season 18 Ancient Aliens on Location: Evidence of Alien Life
- Season 18 The Shining Ones
- Season 18 The Journey to Immortality
- Season 18 Secrets of Inner Earth
- Season 18 Return of the Egyptian Gods
Ancient Aliens - Season 18 Episode 11 Ancient Aliens On Location: Incredible Structures
7.00 42 minutes Ancient Aliens has traveled to many mysterious sites that seem to defy explanation. Now, Giorgio Tsoukalos takes a look back at some of the most incredible structures we’ve visited all over the world. Structures that, as far as Giorgio is concerned, provide undeniable evidence of extraterrestrial contact.
