S4, E2: A strange structure might point the way to a lost civilisation's fountain of youth. Also, bizarre marks across the eastern US leave experts baffled.
Documentary · 26 Jul 2022 · 40 min
Information
- Released
- 2022
- Run Time
- 40 min
- Rated
- PG
- Regions of Origin
- United States, United Kingdom
- © 2017 Discovery Communications Inc.
Languages
- Original Audio
- English (United Kingdom), English
- Audio and Subtitles
- English (United Kingdom) (AAC, Always On)