In the Shade of Burning Mountains

S1 E2: Today more people than ever live in close proximity to volcanoes. While the giants are sleeping, these metropolises grow in seeming safety. But the chance of a catastrophe looms over them. But at the same time: Didn't volcanoes fuel the evolution of very advanced cultures? A disappeared nation in the middle of Mexico gives us a clue as to why people are so attracted by the giants.