The most cave-riddled square mile in Iowa, in the Driftless bluffs the glaciers never flattened. More than a dozen caves, from the walk-through Dancehall Cave to tight wild crawls, linked by trails past a natural bridge and a balanced rock. PUBLIC state park, Iowa; some caves may close seasonally to protect bats from white-nose syndrome, so check.
Other places on the map within a couple of hours.
