1. Hannibal, Mo.

In "The Adventures of Tom Sawyer," Tom and his friend Becky Thatcher get lost in a cave. Read aloud the first two pages of Chapter 29 in this famed novel in conjunction with a visit to Missouri's first show cave. Take a 55-minute tour of the cave depicted in the novel, and learn about the history of the dark spaces, the creatures who live there and how Samuel Clemens, who used the pen name Mark Twain, came to tell the story. Contact: 573-221-1656; www.marktwaincave.com/Main.html Above: The Mark Twain Book & Gift Shop in Hannibal, Mo.
AP file photo by Tom Gannam
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