The John Seigenthaler Pedestrian Bridge (previously called the Shelby Street Bridge or Shelby Avenue Bridge) is a truss bridge that spans the Cumberland River in Nashville, Tennessee. The bridge spans 3,150 ft and is one of the longest pedestrian bridges in the world. The bridge was the first in North America to have concrete arched trusses. In 1998 the John Seigenthaler Pedestrian Bridge was admitted to the National Register of Historic Places, due mainly to the unique truss design. Declared to be in "poor" condition in 1992, the bridge was closed to vehicular traffic in 1998. As part of the bridge's renovation for pedestrian use, an extensive new lighting system was installed. The bridge was refurbished and includes an elevator, ramps, and stairways. The bridge has a center lane that is 15 feet across to accommodate bicycles. On each side of the bicycle lane are 10-foot-wide elevated boardwalk-style sidewalks. The bridge includes four scenic pedestrian overlooks that, in the metal of the railing, have artistic renderings of the history of life on the Cumberland River. The bridge is dramatically lit at night.—Wikipedia
Lifeguard tower along the seashore of Johnson Beach in the Perdido Key Area of the Gulf Islands National Seashore. Lifeguard towers are used at recreational beaches or public swimming pools to watch and supervise swimmers in order to prevent drownings and other dangers. Lifeguards scan for trouble from the structures, which vary from beach bungalows by the ocean to poolside towers. Lifeguard towers are also used to spot sharks and other threats. Gulf Islands National Seashore offers recreation opportunities and preserves natural and historic resources along the Gulf of Mexico barrier islands of Florida and Mississippi. Some islands along the Alabama coast were originally considered for inclusion, but none is part of the National Seashore. The protected regions include mainland areas and parts of seven islands. The color of the sand in the region is exceptionally white. The Florida District of the seashore features offshore barrier islands with sparkling white quartz sand beaches (along miles of undeveloped land), historic fortifications, and nature trails. Mainland features near Pensacola, Florida, include the Naval Live Oaks Reservation, beaches, and military forts. All Florida areas are accessible by automobile. The Mississippi District of the seashore features natural beaches, historic sites, wildlife sanctuaries, islands accessible only by boat, bayous, nature trails, picnic areas, and campgrounds. The Davis Bayou Area is the only portion of the National Seashore in Mississippi that is accessible by automobile. Petit Bois, Horn, East Ship, West Ship (location of Fort Massachusetts), and Cat islands are accessible only by boat. The 4,080 acres Gulf Islands Wilderness offers special protection, within the seashore, to parts of Petit Bois Island and Horn Island, Mississippi. Four visitor centers, staffed by National Park personnel, are located within Gulf Islands National Seashore.—Wikipedia
