Caverna Santana

Caverna de Santana, also Caverna de Sant'Anna, is a cave located inside the Alto Ribeira Tourist State Park, along the road connecting the towns of Apiaí and Iporanga, to the south of the State of Sao Paulo, Brazil. The Flowers' Hall, displaying thousands of flowers of aragonite, and the Taqueupa Hall as one of the many other formations found in the cave, are ranked among the most beautiful and ornate in the world.

Source: Wikipedia