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| | The Cave Source |
 | | Graham Cave State Park, Danville, MO This is a sandstone cave that was occupied by Indians around 8000 BC. |
 | | Mark Twain Cave, Hannibal, MO This is the cave that Mark Twain most likely used in The Adventures of Tom Sawyer when Tom and Becky Thatcher become lost. |
 | | Meramec Caverns, Stanton, MO Onondaga Cave State Park, Leasburg, MO One of the largest lighted caves in the state, and containing a lot of formations--including large pieces of onyx. |
| www.cavesource.com /regions/reg_usa5.htm (257 words) |
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