7. Wild cave Tour, Kentucky
The Mammoth Cave is spread across 400 miles and houses stalactites and gypsum formations. The cave is the largest of all cave systems in the world and attracts many to undertake deep cave explorations.
Image credit: wordpress
Pages: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40