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  2. Caverns of Sonora - Wikipedia

    en.wikipedia.org/wiki/Caverns_of_Sonora

    The cave is formed in 100-million-year-old Segovia Limestone, of the Edwards Group. The formation of the cave itself probably occurred between 1.5 and 5 million years ago. The cave is formed primarily along joints, which allowed gases to rise up from depths of around 1.5 mi (2.4 km) to then depths of about 300 ft (91 m).

  3. List of lava tubes - Wikipedia

    en.wikipedia.org/wiki/List_of_Lava_Tubes

    Elmenteita Badlands north of Mt. Eburru – several small caves [2] Leviathan Cave – At 12.5 kilometres, it is the longest lava tube in Africa. [3] Emuruangogolak Volcano caves [2] North Chyulu hills area – 20 caves are known [2] Hells Teeth [2] Kimakia Caves [2] Mathioni [2] Skull Caves [2] Kimakia Cave [2]

  4. Alabaster Caverns State Park - Wikipedia

    en.wikipedia.org/wiki/Alabaster_Caverns_State_Park

    It is home to the largest natural gypsum cave in the world that is open to the public. [3] The gypsum is mostly in the form of alabaster. There are several types of alabaster found at the site, including pink, white, and the rare black alabaster. This black alabaster can be found in only three veins in the world, one each in Oklahoma, Italy and ...

  5. List of karst areas - Wikipedia

    en.wikipedia.org/wiki/List_of_karst_areas

    Shaanxi tiankeng cluster, discovered in 2016, it is one of the largest in the world comprising forty-nine sinkholes and more than fifty funnels ranging from 50–100 metres in diameter. South China Karst, World Heritage Site; Stone Forest; Xiaozhai Tiankeng, also known as the Heavenly Pit, is the world's largest sinkhole. [3]

  6. 11 unique caves that you can spend the night in - AOL

    www.aol.com/lifestyle/11-unique-caves-spend...

    From Europe to the USA, you need to see these caves that will blow any hotel room out of the water.

  7. Sudwala Caves - Wikipedia

    en.wikipedia.org/wiki/Sudwala_Caves

    Another view deeper into the caves The entrance chamber. One of the flowstone features in the Sudwala Caves. The Sudwala Caves in Mpumalanga, South Africa, are set in Precambrian dolomite rock, which was first laid down about 2800 million years ago. The caves themselves formed about 240 million years ago. They are one of the oldest caves in the ...

  8. Talus cave - Wikipedia

    en.wikipedia.org/wiki/Talus_cave

    A talus cave in Yosemite National Park, California. A talus cave, also known as a boulder cave, is a type of cave formed by the gaps between one, or more commonly many large boulders. [1] Talus caves can be formed anywhere large boulders accumulate in a pile, such as in scree at the base of a cliff.

  9. Sistema Sac Actun - Wikipedia

    en.wikipedia.org/wiki/Sistema_Sac_Actun

    Including connected dry caves makes Sistema Sac Actun 386.122 km (239.925 mi) long, the second longest cave in Mexico [2] and third longest worldwide. [ 6 ] On December 9, 2004, after a dive with two other teammates, Kent Hirsch and Michael Nast were drowned deep in the cave as they got lost and exhausted their oxygen supply.