Throughout out its active history, Florida’s St. Marks Lighthouse had to depend on rain water gathered in cisterns. Historical records indicate that one of the cisterns was underneath the keeper’s house. However, having four-foot thick walls with no openings, and no with no opening in the floor, the space beneath the house has remained a mystery – that is until now. During removal of vinyl floor tile for asbestos mitigation, the cistern was exposed. The void measured seven feet by ten feet and ten feet deep, and was completely intact.
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