1.Mammoth Cave, USA.
Located in the Mammoth Cave National Park in Kentucky, it’s the world’s longest cave system, with more than 630 km in length. The full of limestone natural phenomenon, another UNESCO World Heritage Site, is carved by the Green River and its tributaries. The cave is formed 100 million years ago but the geological process is still continuing.
2.Reed Flute Cave, China.
The cave known as “the Palace of natural Arts” is located in the north-west of China. According to a legend, the name Reed Flute comes from the believing that the reed by the cave’s mouth could be made into flutes. Reed Flute cave can stun the human spirit every time a man looks at the majestic fairyland of stalactites, stalagmites, stone pillars, stone curtains, birds, plants and animals in fantastic shapes and colors. Also, an underwater river adds to the spectacular ambient. It’s only 240 meters long, but having in mind the landscape it’s definitely worth visiting.
3.Ali-Sadr Cave, Iran.
This 70 million years old underground cave is 40 meters high and contains several large, deep lakes. A river is flowing through it, so the transportation is done only by boat. 11 km long water canals were discovered recently. Some of them lead to a place called “Island.” A lot of ancient artworks add to the beauty of the cave. Animals, hunting scenes, bows and arrows can be seen on the walls. Tourists can see this by using a pedal boat.
4.Lechuguilla Cave, USA.
Lechuguilla Cave is the fifth longest cave in the world, with 203 km, and deepest in continental US (489 m). It’s located in Carlsbad Caverns National Park, New Mexico. It’s most famous of its rare and unusual geology. Except its extreme size, the cave offer a large variety of rare speleothems, some of which had never been seen anywhere in the world. Lechuguilla Cave surpassed its nearby sister, Carlsbad Caverns, in size, depth, and variety of speleothems, though no room has been discovered yet in Lechuguilla Cave which is larger than Carlsbad’s Big Room. Unfortunately, Access to the cave is limited to approved scientific researchers, survey and exploration teams, and National Park Service management-related trips.
5.Waitoomo Glowworm Cave, New Zealand.
This cave is famous because of the worms hanging on the roof which shine like stars, Which is actually a chemical reaction happening inside of their tails. These creatures can be found only here. Except that, the cave could offer the tourists a lot of cave decorations, limestone, and the magnificent Cathedral cavern well known for its great acoustics. It’s believed that the cave is formed about 30 million years ago.
Eisriesewelt cave is located near Werfen, Austria. It’s one of the world’s longest cave with over 42 km. The cave was formed by a Salzach river, which eroded into the mountain. In the cave can be seen a lot of crystal forms, created by thawing snow which drained into the cave and froze during winter. Eisriesenwelt is opened for visitors from May to October. Over 200 000 tourists come every year to see this wonder of nature.
7.Phong Nha Cave, Vietnam.
Another cave recognized as world’s heritage by UNESCO is the Phong Nha Cave in Phong Nha-Ke Bang National Park in Vietnam. The 7729 meters long cave system offers spectacular sight of 14 grottos and plenty of underground rivers. The cave is also known as kingdom of grottos. Most of the rivers combine with the Gianh River and run to the sea.
8.Skocjan Caves, Slovenia.
Skocjan Caves were entered on UNESCO’s list of natural and cultural world heritage sites in 1986, due to their scientific importance, acknowledged by international scientific circles. The highest cave system in Europe is full of amazing stalactites and stalagmites. The Reka River adds to the wonderful nature of this global phenomenon. It flows on the surface in the first part, but then disappear underground and continues its way through the caves, where creates a magnificent view.
9.Jeita Grotto, Lebanon
The Jeita Grotto is a compound of two separate but interconnected karstic limestone caves: the upper grotto and lower grotto. The cave is situated in the Nahr Al-Kalb valley, locality of Jeita, near the Lebanese capital Beirut. The caves have formed over millions of years due to the dissolution of limestone. The 2130 meters long upper cave isn’t entirely accessible for tourist; only 750 meters can be visited via a specially conceived walkway. Access of the rest remains restricted due to ecological reasons. A great variety of stalactites, stalagmites, columns, mushrooms, ponds, curtains and draperies can be seen in the upper cave. Characteristic for the lower cave is the underwater river, broken up by several small cataracts and rapids, and the lake named Dark Lake. It’s full with wonderful speleothemes. It is accessible only by electric boats for a distance of 500 meters.
10.Cueva de los Cristales (The Crystal Cave), Mexico.
Cueva de los Cristales (The Crystal Cave) is part of Naica Mine in Chihuahua, Mexico. It was discovered in 2000 by miners while excavating a new tunnel. The 300 meters deep cave contain some of the largest crystals ever found on Earth. The largest one found until today is 11 meters in length, 4 meters in diameter and 55 tons weight. Although the scenery is amazing, people must be careful when enter the cave because of the sharpness of crystals. However, no one can endure inside for long. The temperature is about 58 C degrees and humidity is 90 to 100 percent. Without proper protection people can stay there approximately 10 minutes.