The Barnacle Historic State Park is a 5-acre (2.0 ha) Florida State Park in the Coconut Grove neighborhood of Miami, Florida at 3485 Main Highway.Built in 1891, it is the oldest house in its original location in Miami-Dade County. The Barnacle was the home of Ralph Middleton Munroe, one of Coconut Grove’s founders, as well as founder and Commodore of the Biscayne Bay Yacht Club. He was also a leading designer of sailing yachts.