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The Ombilin Coal Mine (formerly PT Tambang Batubara Ombilin (TBO)) is a coal mine near Sawahlunto, West Sumatra, Indonesia. It is located located in a narrow valley along the Bukit Barisan mountains, among the Polan, Pari and Mato hills, approximately 70 kilometres (43 mi) northeast of Padang. Coal was discovered in the mid-19th century by Ir. de Greve, and mining was...
Onondaga Cave State Park is a Missouri state park located on the Meramec River approximately 5 miles (8.0 km) southeast of the village of Leasburg. The park was established in 1982. Park activities include cave tours, camping, fishing, hiking, picnicking, and swimming.
In 1850, the area was settled by George and Statirah Cresswell, who moved to the region from Washing...
Onyx Cave is a solutional cave system with about 0.5 miles (0.8 km) of passages formed in Permian limestone in the Santa Rita Mountains of Arizona. It is part of the Coronado National Forest. It was designated a National Natural Landmark in 1974.
The cave became a favorite spot to explore in the 1940s and 1950s. Vandals broke the formations and used paint on many wall...
The Oparara Basin Arches are a number of natural limestone tunnels formed by the Oparara River, in the Oparara Basin, New Zealand. The two most famous ones are the 'Oparara Arch', large enough for a multi-storey house, and the 'Moria Gate Arch', which is smaller in height.
The arches can be reached by a forestry road from the main road approximately 9 km north of Kara...
The Oppenheimer cellar labyrinth is a system of cellars, corridors and staircases of up to five levels below the city of Oppenheim that is at least 40 kilometers long.
Optymistychna is a gypsum cave located near the Ukrainian village of Korolivka, Chortkiv Raion, Ternopil Oblast. Approximately 264 km (164 mi) of passageways have been mapped within. As a result, it is the longest cave in Eurasia and the sixth-longest cave in the world, after Mammoth Cave, Sistema Sac Actun, Jewel Cave, Shuanghedong and Sistema Ox Bel Ha. It is also t...
Oregon Caves National Monument is a national monument in the northern Siskiyou Mountains of southwestern Oregon. The main part of the 488-acre park, including the marble cave and a visitor center, is located 20 miles (32 km) east of Cave Junction, on Oregon Route 46. A separate visitor center in Cave Junction occupies 4 acres of the total. Both parts of the monument, ...
These two have interesting side passages and several entrances.
Ovis Cave (216 ft / 66 m) One of the "Least Challenging Caves" Ovis Cave contained 36 bighorn skulls when it was discovered in the 1890s. In Ovis, ceiling heights exceed 25 ft (7.6 m), and some outside light is visible throughout.
Length: 216 feet
Distance from visitor center: Cave Loop
You can wal...
Ozark Caverns is an unlit cave located within the south side of Lake of the Ozarks State Park. It is part of a large group of "wild" caves in Missouri. Ozark Caverns is one of three "tamed" caves that is accessible to tourists (the other two being Bridal Cave and Jacob's Cave). It is part of the Osage River Cave region. The cave is walk-through and wheelchair accessib...
Özkonak Underground City is an ancient city built on the northern slopes of Mt. Idis about 14 km northeast of Avanos in Turkey. The city has many strata made up of volcanic granite its larger areas are connected to each other by tunnels. Özkonak had a built in communication system of pipes to each of its levels, unlike Kaymaklı and Derinkuyu which have no su...
The Padirac Chasm or Gouffre de Padirac is a cave located near Gramat, in the Lotdépartement, in France. The chasm itself is approximately 99 m (325 ft) around its rim with a diameter of approximately 35 metres (115 ft). Visitors descend 75 m via a lift or a staircase before entering the cave system. The cave, at a depth of 103 metres (338 ft), contains a subte...
The Paisley Caves complex is a system of four caves in an arid, desolate region of south-central Oregon, United States. One of the caves may contain archaeological evidence of the oldest definitively-dated human presence in North America. The site was first studied by archeologists in the 1930s. Scientific excavations since 2002 have uncovered substantial new discover...
Near Pak Ou (mouth of the Ou river) the Tham Ting (lower cave) and the Tham Theung (upper cave) are caves overlooking the Mekong River, 25 km to the north of Luang Prabang, Laos. They are a group of two caves on the west side of the Mekong river, about two hours upstream from the centre of Luang Prabang, and are frequently visited by tourists.
The caves are noted for ...
Palace Cave is on the hike route to the 1000 years old tree. It isn't too big and you can see first grotto as the sunlight reaches there. If you want to go further to the next grotto you need to have a light with you as it is completely dark!
Price: $958.15