Maquoketa Caves has more caves than any other state park in Iowa, and the point of the place is that you go in them yourself. A trail system links the caves, the limestone formations and the overlooks, and most of them can be entered by anyone of average fitness, though a few reward people willing to get filthy. Dancehall Cave, the largest, runs about 1,100 feet with a boardwalk and lighting through it; others are unlit crawls where you supply your own torch.
The park sits in the Driftless Area, and that is why the terrain looks nothing like the rest of Iowa. The last ice sheets went round this region rather than over it, so instead of being planed flat and buried under glacial till it has had hundreds of thousands of years of ordinary erosion working on it. The result is bluffs, deep valleys, limestone formations and a natural bridge standing high above Raccoon Creek.
In 1991, 111 acres on the east side of the park were listed as a historic district on the National Register of Historic Places, largely for the Civilian Conservation Corps work that built the trails and shelters.
One piece of recent history matters if you plan to go underground. The caves were closed to people entirely between 2010 and April 2012 to protect the resident bats from white nose syndrome. They reopened with rules: you may not bring in clothing, boots or gear worn in any other cave, and there is a decontamination requirement at the trailhead. It is a small ask for keeping a bat colony alive.
The park is northwest of the city of Maquoketa in Jackson County and is free to enter.
Time it right, because the caves shut for nearly half the year. The park closes them every year from 15 November until 1 April, because they serve as a hibernaculum for overwintering bats. Outside that window the caves are open without a permit, and there are about thirteen of them at very different levels of effort: some are a walk, others want real caving and a willingness to crawl through tight ground. Read the white-nose signs at the entrance before you go underground.
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Other places on the map within a couple of hours.
