This 140-year-old beacon off the Florida Keys marks the wreck of a Navy ship that once roamed the Caribbean hunting pirates.

A nude beach alongside a washed-out road.

A peaceful, unique botanical garden complete with waterfalls, mini islands, and swans.

A hidden beach at the end of a tunnel of mangrove trees.

This ancient sinkhole-turned-healing-pool is a treasure trove of archeological discoveries and may even be the Fountain of Youth.

This Florida sinkhole hides a rainforest-like micro-environment in its depths.

Florida might be at its most surreal in this museum devoted to the famed Spanish artist.

This abandoned Civil War fortress is slowly being swallowed by the waters of Lake Borgne.

Once defending the city of New Orleans from invasion by sea, this fort faces an uncertain future.

Built following the War of 1812, this fort has withstood hurricanes for centuries.

A humid oasis combines recreation with exploration in a unique underwater cavern.

The "worst battleship ever built" is enjoying a grand second act, submerged 30 feet in the Gulf of Mexico.

One of the only Florida forts to remain in the hands of the Union all through the Civil War still stands as a historic stronghold.

This now-deactivated naval base defended the Florida coast for centuries.

Despite sitting firmly in the global cradle of the Church of Jesus Christ of Latter-day Saints, this Hare Krishna temple is host to one of the largest color festivals outside India.

An extraordinary mixture of natural beauty and man-made phenomena.

This lake in the Cascades lives up to its name, disappearing down a hole every spring.

This Big Sur waterfall drops 80 feet directly into the Pacific Ocean, and inspired the hillside house up top.

A 300-yard long natural tunnel runs through a ridge deep in the Appalachian Mountains.

A meditative space out of a fantasy story.

A clear blue swimming hole with hidden caves, still unexplored.

At this Denver landmark, the meals are compulsory, the sopapillas are complimentary, and the insanity is everywhere.

Ruins of the elaborate house where the enigmatic costume designer threw glamorous parties for New York's theatrical elite.

One of the most scenic stretches of road in America winds between some of the country's oldest trees.