Although the Cuevas de Mármol in Patagonia, Chile, are not exactly easy to reach, the beauty of these caves in the middle of Lago General Carrera more than makes up for the effort.

Cuevas de Mármol
© David Storm/gettyimages

Blue Period, Pablo Picasso? Nope! This artwork was not created by human hand, but by the icy waters of General Carrera Lake, which spring from the nearby Andes and modeled the bizarre rock formations of the Cuevas de Mármol in a creative process that took over 6200 years. Some of the marble caves, which look spectacular as they change color and shading depending on the time of day and how the light falls, can be explored from the water. Boats are available to hire in the village of Puerto Río Tranquilo.