1. Florida East Coast Strauss Trunnion Bascule Bridge
This double track railroad structure is the oldest remaining bridge crossing the mighty St. Johns. It was originally constructed by oil magnate Henry M. Flagler, to provide better access to South Florida and served as the final chapter of Jacksonville's decline as a major tourist center. This 1925 bascule bridge replaced the original swing-span bridge that opened on January 5, 1890.