Adventure

Marengo Cave Embark on a guided (and muddy!) exploration of an undeveloped natural cave, or opt for a (cleaner) walking tour of Marengo's larger caverns; pan for treasure; learn about cave conservation and cave ecology. 400 E. State Rd. 64, Marengo, IN; 888 702 2837. Fee.

Wyandotte Caves Wander through immense passageways and marvel at delicate crystal and rock formations; don a petzl-light-equipped helmet to explore unlit passageways and dark caverns. Closed November to late February. 7315 Wyandotte Cave Rd., Leavenworth, IN; 888 702 2837. Fee.