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  2. List of quarries in the United States - Wikipedia

    en.wikipedia.org/wiki/List_of_quarries_in_the...

    Mega Cavern, a cavern in Louisville, Kentucky created by limestone quarrying over 42 years during the middle of the 20th century. Deemed the largest building in the state, it has 4,000,000 square feet (370,000 m 2 ) and is now used for tourism including zip lines, for storage and other business.

  3. Ohio Caverns - Wikipedia

    en.wikipedia.org/wiki/Ohio_Caverns

    Ohio Caverns is a show cave located 30 miles (48 km) from Dayton, Ohio near West Liberty, in Salem Township, Champaign County, Ohio in the United States.A popular tourist destination and member of the National Caving Association, it is the largest of all the cave systems in Ohio and contains many crystal formations.

  4. Hocking Hills State Park - Wikipedia

    en.wikipedia.org/wiki/Hocking_Hills_State_Park

    Hocking Hills State Park is a state park in the Hocking Hills region of Hocking County, Ohio, United States.In some areas the park adjoins the Hocking State Forest.Within the park are over 25 miles (40 km) of hiking trails, rock formations, waterfalls, and recess caves.

  5. Caverns of Sonora - Wikipedia

    en.wikipedia.org/wiki/Caverns_of_Sonora

    The Caverns of Sonora, a National Natural Landmark, [1] is a unique cave located 8 miles (13 km) west of the small city of Sonora, the seat of Sutton County, Texas. It is a world-class cave because of its stunning array of calcite crystal formations, especially helictites .

  6. Cave-in-Rock State Park - Wikipedia

    en.wikipedia.org/wiki/Cave-in-Rock_State_Park

    The park's primary feature is a 55-foot (17 m)-wide riverside cave formed by wind and water erosion and cataclysmic effects of the 1811–12 New Madrid earthquakes.The Cave-in-Rock was worn into the limestone bluffs of the Ohio River by floods, especially those caused by glacial meltwater following the Wisconsin ice age. [3]

  7. List of deepest caves - Wikipedia

    en.wikipedia.org/wiki/List_of_deepest_caves

    Jojar Cave 1300 [47] 2.2 km (1.4 mi) Iran ... Map all coordinates in "List of deepest caves" using OpenStreetMap. Download coordinates as: KML; GPX (all coordinates)

  8. A Camper Was Playing With Google Maps—and Stumbled ... - AOL

    www.aol.com/camper-playing-google-maps-stumbled...

    A man planning a camping trip using Google Maps ran across a uniquely curved spherical pit in Quebec. It may be an ancient asteroid impact crater. A Camper Was Playing With Google Maps—and ...

  9. List of submarine volcanoes - Wikipedia

    en.wikipedia.org/wiki/List_of_submarine_volcanoes

    Map of world's major seamounts. A list of active and extinct submarine volcanoes and seamounts located under the world's oceans. There are estimated to be 40,000 to 55,000 seamounts in the global oceans. [1] Almost all are not well-mapped and many may not have been identified at all. Most are unnamed and unexplored.