Named for Iowa's state rock, this park sits in a region famous for geodes—hollow mineral nodules lined with crystals. Collecting rules vary by location, so the park itself is best treated as a geological landscape rather than a free-for-all digging site.
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/geode-state-park