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Mammoth Cave in Kentucky. World's largest cave system. Over 390 miles of passageways!

Mammoth Cave National Park • Mammoth Cave, Kentucky. Cancellation stamp: September 6, 1992

Mammoth Cave National Park, Central Kentucky, USA. The longest known cave system in the world. There are over 400 miles of caves that have been explored.

Mammoth Cave-4 generations of my family have worked there, including myself. It was my first paying job.

Mammoth Cave KY, Mammoth Cave along with other caves around the area are wonderful!

Mammoth Cave National Park, Ky. I loved this attraction and I would love to take my kids!

mammoth cave = good daddy/daughter times :)

Mammoth Cave National Park. Went there for the first time (that I can remember) last summer with Tony. It was amazing, mysterious, dark, and beautiful.