Nickajack Cave was partly flooded by reservoir construction and now shelters major bat colonies. Visitors can observe the cave area from approved water or shoreline locations, especially during seasonal bat emergence; entering the cave or disturbing wildlife is not appropriate.
Filed under roadside oddities: giant objects, odd monuments and things built for no clear reason.
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Source: tn.gov/twra/wildlife-management-areas/cumberland-plateau-r3/nickajack-cave-wma.html