Hannibal
About an hour north: Mark Twain’s hometown and a genuinely fun cave tour—our top rainy-day pick.
Mark Twain’s Town
Hannibal sits on the Mississippi and leans all the way into being the boyhood home of Mark Twain (Samuel Clemens)—the inspiration for Tom Sawyer and Huck Finn.
- Mark Twain Boyhood Home & Museum — the restored home and exhibits; the famous whitewashed fence is right there.
- Historic downtown — shops, candy, riverfront, and a classic small-town Main Street.
- Riverboat & river views — see the big river that runs through the stories.
Mark Twain Cave (the kid-winner)
Just outside town, the Mark Twain Cave offers guided walking tours through cool, well-lit passages—~52°F year-round, which makes it a perfect escape from July heat or a rainstorm.
- Best for: all ages; easy walking tour with a guide and good stories.
- Bring: a light layer (it’s chilly inside) and closed-toe shoes.
- Tip: book/check tour times ahead in summer; it’s popular.
Make a Day of It
- Morning: drive up, take the cave tour first (beat the heat and crowds).
- Lunch: downtown Hannibal.
- Afternoon: Twain sites + riverfront, then head back.
Rainy-day MVP. If a storm settles over camp, Hannibal’s cave + downtown is the best dry, fun, all-ages backup on this list.