Also known as "guiding lights," some of America's lighthouses are beloved and preserved, while others are being lost to neglect and the ravages of the sea. (All photos by Carol M. Highsmith)
Rose Island Lighthouse in Rhode Island.
This lighthouse on Cape Hatteras in North Carolina is one of America's most-photographed.
The Edgartown Light Station, on Martha's Vineyard in Massachusetts, was built in 1881.
Hillsboro Inlet Light, located between Fort Lauderdale and Boca Raton, Florida, marks the northern limit of the Florida Reef, an underwater coral formation on the lower east coast of the state.