Marble Caves (Cuevas de Mármol)
Chile’s marble caves are only accessible by boat. After all, they were forged by water. The caves are the product of waves from Lake General Carrera—a large glacial lake on the Chile-Argentina border— washing up against the calcium carbonate cliffside rock, carving out a dazzling blue-white labyrinth that reflects the blue of the water it abuts. According to Atlas Obscura, the caves took at least 6,000 years to form—practically no time, as far as geological history goes.
