Pennsylvania's largest cave system by volume extends beneath Chestnut Ridge in Fayette County. The underground caverns are open only from mid-April through late October for guided and self-guided experiences, closing each winter to protect hibernating bats.
Filed under roadside oddities: giant objects, odd monuments and things built for no clear reason.
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Source: pa.gov/agencies/dcnr/recreation/where-to-go/state-parks/find-a-park/laurel-caverns-state-park