How Do Archaeologists Figure Out What Ruins Were? | The Cliff Mine Archaeology Project
11:45
How to Make 1 Million Copper Bars | The Quincy Smelter
16:00
My Best Agate Haul of the Year—Nov. Rock Hunt on Lake Superior
15:03
The Largest Prehistoric Copper Mine in the World
17:17
How They Made This Record-Breaking Bridge | Portage Lake Bridge, Michigan
20:46
Modern Life Depends on This Extinct Rock | Banded Iron Formations
17:43
Henry Ford's "Utopian" Towns | Alberta, Michigan
43:08
Behind the Scenes of a $3 Billion Megaproject (Soo Locks Tour)
18:44