The grandeur of Yosemite National Park in California’s Sierra Nevada Mountains is a spectacular amalgamation of giant sequoias and massive granite cliffs like El Capitan and the Half Dome. In the season premiere, Masters explores the intriguing story of the Yosemite Firefall at Glacier Point, where in 1872, James McCauley began pouring burning embers down the mountain on summer evenings. It became such a spectacle that for years people would amass at the bottom of the mountain to watch the fiery embers cascade down the mountain at 9 p.m. sharp. The event was so popular that even President John F. Kennedy came by for a viewing.