Capt. John Foley Horr House
The Capt. John Foley Horr House consists of 19th-century ruins located on the northern end of Key Marco. Listed on the National Register of Historic Places, the site preserves the remains of a residence and pineapple plantation empire established in 1877. The structures are built from tabby—a pioneer-era concrete made of shells, lime, and sand—with walls reaching 16 inches in thickness. The site also holds archaeological significance, as it is built upon ancient shell mounds originally constructed by the Calusa people.
Access to the site is managed through the Key Marco gatehouse, where visitors are required to pay an entry fee of $10 per car or $5 for bicycles. For preservation purposes, the ruins and the immediate grounds are fenced off, limiting public viewing to the street. There is no pedestrian access to the interior of the structures or the surrounding lawn, as the site is designated for viewing from a distance.
