Mark Twain Cave, Show cave and National Natural Landmark in Hannibal, Missouri
The limestone labyrinth stretches through multiple underground passages, creating a complex network of geological formations dating back millions of years.
Originally named McDowell's Cave, the site became a tourist destination in 1886, making it the oldest continuously operating show cave in Missouri.
Samuel Clemens incorporated the cave into The Adventures of Tom Sawyer under the name McDougal's Cave, leading to its renaming as Mark Twain Cave in 1880.
The cave maintains a constant temperature of 52 degrees Fahrenheit throughout the year, requiring visitors to bring light jackets even during summer months.
The cave contains Louisiana Lithographic Limestone, a specific type of soft limestone found only within a 35-mile radius of Hannibal and Louisiana, Missouri.
Location: Missouri
Website: http://marktwaincave.com
GPS coordinates: 39.68860,-91.33150
Latest update: May 11, 2025 21:36
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Mark Twain Memorial Bridge
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Mark Twain Memorial Bridge
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Marion County Courthouse
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Hock Building
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