Pt Barnum's Museum, Deadman's Valley, Chateau Montsegur (S01E04)

PT Barnum profits immensely from the vulnerable, even as his attractions mysteriously catch fire one after another. Meanwhile, a band of ambitious prospectors ventures into unexplored lands, hoping to strike it rich. In a tragic turn, a group of 200 men and women willingly gives their lives to a colossal blaze.