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Huge caves of a very respectable age (from a few million to several thousand years) – it is bewitching and a mysterious sight created by nature. Some of them so beautiful that they deserve special attention. 
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1. Cueva de los Crystals (Mexico)
Discovered in 2000 during drilling, volcanic Crystal cave – this is a real sparkling miracle. Many of crystals about half a million years old can reach one meter in diameter, and their edges are sharp like a razor blade. By the way, the temperature in the cave can drop to 40 degrees below zero.
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2. Waitomo Glooveorm Cave (New Zealand)
This oldest (30 million years old) cave is one of the most vivid manifestations of natural terrestrial bioluminescence. Thousands fireflies live on its walls and emit dazzling blue light, to attract prey.
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3. Blue Grotto (Italy)
Grotto Azzurro is located on the island of Capri and is known for its radiant blue water. Locals claim that in it sirens and devils live. When sunlight enters the cave through the underwater entrance, the water filters out the red light and leaves only the blue light that illuminates the entire cave.
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4. Vatnajokul Glacier Cave (Iceland)
Glacier caves are best visited in the autumn-winter period, when the ice is especially strong and there is no risk of its collapse. Bright blue color – This is a special “sign” of such glacial caves that are not exposed to ultraviolet rays of the sun.
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5. Phraya Nakhon Cave (Thailand)
Praia Nakhon Cave is located in Khao Sam Roy National Park Yot. Through the collapsed upper part of the cave penetrate the sun rays and fancifully illuminate the pavilion Kuh Karunas, built in 1890 for the king of Thailand.
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6. Marble Caves (Chile)
Marble caves are located in Patagonia near Lake General Carrera This is the most beautiful cave structure in the world in which crystal clear water is literally highlighted dazzling blue ice walls. Magical, fabulous, unreal and almost unearthly sight!
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7. Caves on the slope of Mutnovsky volcano (Russia)
An incredible joke of nature – to create glacial caves almost on the slope of the volcano. Hot springs “cut out” amazing forms of these caves, and the light penetrating through their arches, creates an incredible play of colors: green, blue and magenta.
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8. Dongzong Cave (China)
The cave was formed several thousand years ago, but now it use in an extremely original way – since 1984 in it conduct classes. It accommodates about 200 students and 8 teachers.
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9. Fingal’s Cave (Scotland)
This amazing natural creation is located on Staffa Island. The incredible geometric structure of the cave is completely natural origin, it was formed by hot lava, which when cooled created hexagonal patterns, and then further cracks already created characteristic columns columns.
See also – Singing cave of Fingala
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10. Reed Flute Cave (China)
The only artificial creation in this cave is modern lighting. The age at the cave is venerable, on its walls found inscriptions dating back to 792 year of our era. And the name was given in honor of the reeds that grow in abundance next to the entrance. Indoor cave formations plus amazing lighting give an incredible effect.
See also – Reed Flute Cave
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11. Ellison Cave (USA)
This dark cave is 180 meters deep in the state. Georgia. A cave is a dream for lovers to descend into the bowels of the earth. Exactly 8 seconds for a free fall of a stone from the surface to bottom.
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12. Kyaut Sai Cave (Myanmar)
Ancient folk tales say that in the 13th century the locals hid in a cave from the invasion of the Mongols. Now on a cliffside right at the entrance to the cave, a Buddhist temple is built. They meditate here monks and tourists taking pictures.
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13. Son Dung Cave (Vietnam)
This is the largest cave in the world, discovered in 1991, located in the Vietnamese province of Quang Binh. Its width is about 200 meters, height – 150 meters, length – more than 10 km. Looks very massive, impressive and majestic.
See also – Conquering an endless cave
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14. Eisriesenvelt Glacier Caves (Austria)
Eisriesenvelt’s largest ice caves were found at the end of 19 century. The cave labyrinth extends over 40 kilometers, and the inner the structure is subject to constant changes, because ice is constantly thaws and freezes again.
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15. Cave of Ordynskaya (Russia)
Ordynskaya cave is located in the Urals, and this is a great place for lovers of diving, as there are more than 5 in the cave kilometers of underwater cameras. The water is so amazingly clear that the underwater view is almost 45-50 meters.
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16. Carlsbad Caves (USA)
Carlsbad Caves are located in the national park New Mexico. The most beautiful cave network aged 4-6 million years, was created by nature as a result of corrosion of limestone sulfuric acid. Massive deposits of gypsum, clay and silt in caves give them an incredible look.
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17. Barton Creek Cave (Belize)
Skulls! This is what distinguishes the Barton Creek Cave. Once her Mayan Indians used for ceremonial and funeral purposes, and because many artifacts lie among the natural cave formations.
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18. The Grotto of Jayta (Lebanon)
“The roar of water” – this is the name of the cave. In the lower part the grotto you will literally be deafened by the sounds of flying water and air that echoes throughout the cave. And in her very the depths of the sounds of nature are replaced by deep underground silence.
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19. Cango Caves (South Africa)
Kango is a network of limestone caves. Many of them far the past served as a home for ancient people, now Kango attracts tourists who crave adventure and thrill.
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20. Aven Arman Cave (France)
Aven Arman, or deep into the ground at 100 meters. In a cave several hundred unique stalagmites, some of which reach 30 meters high.
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