Exploring Mosquita, the largest untouched rainforest in Central America where legends swirl of a white city buried inland.

Explorer examines the global phenomenon of the "cult" of Mary. The episode opens a window into the many ways devotees venerate the Virgin Mary. From a small community in Alabama to thousands of people gathering in Mexico, Mary draws millions of people to shrines and sustains religious tourism that's estimated to be worth billions of dollars a year. The film is a journey into the heart of modern-day Mary devotion around the world.