Iowa's best-known cave park contains a dense network of caverns, passages, sinkholes and natural bridges reached by hiking trails and stairways. Some caves require crawling or wading and may close seasonally for wildlife or safety reasons.
Filed under roadside oddities: giant objects, odd monuments and things built for no clear reason.
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Source: iowadnr.gov/places-go/state-parks/all-parks/maquoketa-caves-state-park