The Wyandotte Caves is a pair of limestone caves located on the Ohio River in Harrison–Crawford State Forest in Crawford County, Indiana, 5 miles (8 km) northeast of Leavenworth and 12 miles (19 km) from Corydon. Wyandotte Caves were designated a National Natural Landmark in 1972, and they are now part of O'Bannon Woods State Park. The cave system is the fifth largest in the state of Indiana, and it is a popular tourist attraction.