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The Atchison Storage Facility, commonly known as the Atchison Caves, is a 2.7 million square foot underground storage facility in a former pillar limestone mine 50 to 150 feet (15 to 46 m) below the ground in the Missouri River bluffs at Atchison, Kansas.
The interior of SubTropolis. SubTropolis is a business complex located inside of a 55,000,000-square-foot (5,100,000 m 2), 1,260-acre (5.1 km 2) mine in the bluffs north of the Missouri River in Kansas City, Missouri, United States.
Bat Cave; Carter Caves State Park; Cascade Caverns; Colossal Cavern; Diamond Caverns; Eleven Jones Cave; Fisher Ridge Cave System; Glover's Cave; Goochland Cave; Great Onyx Cave; Great Saltpetre Cave; Horse Cave also known as "Hidden River Cave" Lost River Cave; Mammoth Cave; Martin Ridge Cave System; Oligo-Nunk Cave System
Mammoth Cave, the longest known cave system in the world The following is a list of the longest caves in the United States per length (over 50 kilometres or 30 miles) of documented passageways. Many passageways are still being discovered; this list is based on the latest verifiable data. [ 1 ]
The Mega Cavern is a 4,000,000 square foot (370,000 m 2) [2] structure located in Louisville, Kentucky.About 75–100 feet (23–30 m) underground, [3] [4] [5] the mine stretches under parts of the Watterson Expressway and the Louisville Zoo. [6]
Caves or caverns are natural voids under the Earth's surface. [1] Caves often form by the weathering of rock and often extend deep underground. Exogene caves are smaller openings that extend a relatively short distance underground (such as rock shelters). Caves which extend further underground than the opening is wide are called endogene caves ...
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The Hopeton Earthworks are an Ohio Hopewell culture archaeological site consisting of mounds and earthwork enclosures.It is located on the eastern bank of the Scioto River just north of Chillicothe in Ross County, Ohio, about 1 mile (1.6 km) east of the Mound City Group and Shriver Circle on a terrace of the Scioto River.