The Bat Caves of Cueva de los Murciélagos, Bolivia (12/20)

Located in the department of Cochabamba, Bolivia, the Cueva de los Murciélagos is a bat-filled cave that houses thousands of bats in its dark, labyrinthine tunnels. While the cave has become a popular tourist attraction, much of its extensive underground system is still unexplored, offering a unique opportunity for those seeking adventure.