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  2. Speedwell Cavern - Wikipedia

    en.wikipedia.org/wiki/Speedwell_Cavern

    The narrow adit is permanently flooded, so after descending a long staircase, access to the cave is made by boat. At the end of the adit, the cavern opens up with fluorspar veins, stalactites and stalagmites, and the so-called "Bottomless Pit". This chamber has an underground lake with a 20 metres (66 ft) high waterfall and an extremely deep ...

  3. Pit cave - Wikipedia

    en.wikipedia.org/wiki/Pit_cave

    Pit cave near Benagil in Lagoa, Portugal A caver rappelling into Mexico's enormous pit cave, Sotano de las Golondrinas Pit cave Haviareň, Little Carpathians. A pit cave, shaft cave or vertical cave—or often simply called a pit (in the US) and pothole or pot (in the UK); jama in Slavic languages scientific and colloquial vocabulary (borrowed since early research in the Western Balkan Dinaric ...

  4. Bottomless pit - Wikipedia

    en.wikipedia.org/wiki/Bottomless_pit

    Bottomless pit may refer to: Bottomless pit (Bible), a place where demons are imprisoned; Bottomless Pit (band), an indie rock band from Chicago, Illinois; Bottomless Pit, a 2016 album by Death Grips; Bottomless pit (video gaming), a level hazard in video games "Bottomless Pit!", an episode of Gravity Falls

  5. Ellison's Cave - Wikipedia

    en.wikipedia.org/wiki/Ellison's_Cave

    Ellison's Cave is a pit cave located in Walker County, on Pigeon Mountain in the Appalachian Plateaus of Northwest Georgia. It is the 12th deepest cave in the United States and features the deepest unobstructed pit in the continental US, named Fantastic Pit. The cave is over 12 miles (19.31 km) long and extends 1063 feet (324 m) vertically. [1]

  6. List of sinkholes - Wikipedia

    en.wikipedia.org/wiki/List_of_sinkholes

    Buraco das Araras – one of the largest quartzitic caves located in Goiás.Considered one of the largest sinkholes (dolinas) in the world; Gruta do Centenário – a cave located in Mariana, Minas Gerais, the largest and deepest quartzite cave in the world, and second in the country in terms of unevenness

  7. Houska Castle - Wikipedia

    en.wikipedia.org/wiki/Houska_Castle

    The pit in the lower levels of the castle is said to be a gateway to hell. Thus, by constructing the Gothic building's defensive walls facing inward, they were able to keep the demons trapped in the lower level's thickest walls closest to the hole of the castle. [6] [11]

  8. Leonora's Caves - Wikipedia

    en.wikipedia.org/wiki/Leonora's_Caves

    Leonora's is in fact not a bottomless pit, but is of substantial depth. Graffiti found on stalagmites and columns date back to 1801 and early reports mentioning "passages leading off St. Michaels Cave" suggest that the site was first explored in the 1700s by British troops; however, it was only until 1864 that Captain Frederick Brome explored ...

  9. New Athos Cave - Wikipedia

    en.wikipedia.org/wiki/New_Athos_Cave

    The abyss on a slope of the Iverian Mountain was known for ages, referred to as the "Bottomless Pit". It was explored in 1961 by an expedition of four: Zurab Tatashidze, [2] Arsen Okrojanashvili, [3] Boris Gergedava, [4] and Givi Smyr. [5] Since 1975, it has been a major tourist attraction, featuring its own underground railway. [6]