The St. Nicholas III is a historic boat in Tarpon Springs, Florida. It is located at the Tarpon Springs Sponge Docks at Dodecanese Boulevard. On August 3, 1990, it was added to the U.S. National Register of Historic Places. References External links Pinellas County listings at National Register of Historic Places Florida's Office of Cultural and Historical Programs Pinellas County listings St. Nicholas III Gallery Sponge diving boats National Register of Historic Places in Pinellas County, Florida Buildings and structures in Tarpon Springs, Florida