"The “Marble Chapels“, in General Carrera Lake, Chile, are mineral formations made of calcium carbonate located on that lake, just a few miles from the small village of Puerto Tranquilo. The formations have three main islets, a few meters away form the shore, called the Cathedral, the Chapel and the Cave. To find the origin of the marble rocks that make up the place we have to go back 370 million years, when and geologic event deposited calcareous sediments."