Our planet is full of mysterious places like hidden mountain peaks behind the clouds or blue depths of the ocean, but there are other places you can see. Such of them are caves. If you have never been in a cave, you know they are afraid of its size and weight that seemed borne by each visitor. However, all the caves are beautiful in their own way, and today we bring you a selection of the most beautiful of them. The curious and original beauty of caves has always attracted the adventurers and lovers of the unknown, beautiful, beautiful. The list of the most beautiful caves:

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Cave of Swallows, Mexico

Cave of Swallows is Karst cave of origin placed in Mexico, in the state of San Luis Potosi. The shape of the cave is a widening tapered down (or bottle) karst collapse. The opening of the cave on the surface of the earth is the elliptical shape (in terms of round, as located on the slope) and has dimensions of 49 by 62 meters, the depth of the dip from 333 to 376 meters (hole on the surface located on the slope). At the bottom of the cave has an elongated shape in plan close to an oval with a nearly flat side. The volume of the space of the cave is estimated at 33110 cubic meters. The bottom of caves and passageways in the deeper levels that are likely to exist, yet poorly studied. To the cave a narrow footpath and dirt road on which can only drive SUVs leads. The dimensions of the cave are such that it is easily possible to place the famous New York skyscraper Chrysler Building. Spanish cave name comes from the Mexican name of swallows – Golondrinas. However, inhabit the cave swifts species common swift parrots and green parakeet species. In the morning a flock of birds fly in a spiral, gaining height until they reach the exit of the cave. In the evening, they return to the cave swifts, moreover, they dive in flocks of several dozen individuals until they reach their level of nesting in a cave. Observing the behavior of birds has become one of the favorite activities of tourists visiting the cave entrance.

Cave of Swallows, Mexico

Cave of Swallows, Mexico. The cave is also quite densely populated by insects and snakes. Due to a large amount of guano on the floor of the cavern, vapors in the presence of air, a large number of bacteria and fungi on walls and mold, prolonged exposure to dangerous cave and unfiltered oxygen equipment. In order to preserve the ecological complex of caves in the descent, it is allowed only one (lower) side of the clearway. At the entrance to the cave on this side are fixed anchors. The descent into the cave takes about 20 minutes by climbing equipment and about 10 seconds when skydiving. Climbing the top takes about two hours and requires good physical fitness and climbing. The cave was known to the people who inhabited this area since ancient times. The first documented study of the cave was made on December 27, 1966.

Blue Cave, Croatia

Melissani, Greece.

Reed Flute, China.

Ice Cave near the Mutnovsky volcano, Russia.