| Udgivet: | 2017 |
|---|---|
| Episode: | Mystery Of The Serpent Mound |
| Genre: | Dokumentar |
Scientist Rob Nelson investigates the world's strangest underground locations.
He uses the latest technology and research to examine these mysteries. Idag: Rob Nelson undersøker mystiske tunneler under flyplassen i Denver. I Ohio vil han avdekke hemmelighetene til en enorm, slangeformet jordhaug.
