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  2. Cave of the Crystals - Wikipedia

    en.wikipedia.org/wiki/Cave_of_the_Crystals

    Cave of the Crystals or Giant Crystal Cave (Spanish: Cueva de los cristales) is a cave connected to the Naica Mine at a depth of 300 metres (980 ft), in Naica, Chihuahua, Mexico. It takes the form of a chamber within the limestone host rock of the mine, and is about 109 metres (358 ft) long with a volume of 5,000 to 6,000 cubic metres (180,000 ...

  3. Crystal Cave, Bermuda - Wikipedia

    en.wikipedia.org/wiki/Crystal_Cave,_Bermuda

    Crystal Cave is a cave in the British overseas territory of Bermuda. It is located in Hamilton Parish, close to Castle Harbour. The cave is approximately 500 m long, and 62 m deep. [1] The lower 19–20 m of the cave are below water level. The cave formed at a time when the sea level was lower; as the sea level rose, many cave formations which ...

  4. Crystal Cave (Sequoia National Park) - Wikipedia

    en.wikipedia.org/wiki/Crystal_Cave_(Sequoia...

    Crystal Cave is a marble karst cave within Sequoia National Park, in the western Sierra Nevada of California. It is one of at least 240 known caves in Sequoia National Park but the only one accessible to the public. Crystal Cave is in the Giant Forest area, between the Ash Mountain entrance of the park and the Giant Forest museum.

  5. Actun Tunichil Muknal - Wikipedia

    en.wikipedia.org/wiki/Actun_Tunichil_Muknal

    Actun Tunichil Muknal (the Cave of the Crystal Sepulchre), also known locally as ATM, is a cave in Belize, near San Ignacio, Cayo District, notable as a Maya archaeological site that includes skeletons, ceramics, and stoneware. There are several areas with skeletal remains in the main chamber.

  6. Yanchep National Park - Wikipedia

    en.wikipedia.org/wiki/Yanchep_National_Park

    Yanchep National Park contains over 570 caves. They were formed by underground streams flowing westward from the Gnangara Mound through Tamala Limestone. [14] [15] Currently, Crystal Cave, Yonderup Cave, and Cabaret Cave are the only caves currently open to the public, although in the past, additional caves have been made accessible to visitors ...

  7. Crystal Cave - Wikipedia

    en.wikipedia.org/wiki/Crystal_Cave

    Crystal Cave may refer to: Crystal Cave, Bermuda; Crystal Cave (Kentucky) Crystal Cave (Ohio) Crystal Cave (Pennsylvania) Crystal Cave (Sequoia National Park)

  8. Secret passage - Wikipedia

    en.wikipedia.org/wiki/Secret_passage

    View inside the Passetto, the secret passage between Vatican City and Castel Sant'Angelo in Rome, Italy. Secret passages, also commonly referred to as hidden passages or secret tunnels, are hidden routes used for stealthy travel, escape, or movement of people and goods.

  9. Crystal Cave (Wisconsin) - Wikipedia

    en.wikipedia.org/wiki/Crystal_Cave_(Wisconsin)

    Crystal Cave is a cave located in Wisconsin’s Pierce County, near the Town of Spring Valley on Highway 29. The cave was discovered in 1881 by local brothers George and William Vanasse. Crystal Cave is a multi-level solutional cave formed in dolomite bedrock in the Prairie du Chien Group.