A luxuriant botanical garden below sea level.

Despite being made of a seashell mortar, the crumbling remains of this historic Florida mill are still standing.

A monument celebrating the idea of reaching inaccessible places.

An 18th-century Spanish watchtower made entirely of seashell and concrete.

A gleaming white tower in ornate Indian style soars above the low-slung bungalows of north Tampa.

Japanese gardens dedicated to the Japanese farmer that refused to throw in the trowel.

Florida castle built with aluminum printing plates.

The ruins of this antebellum sugar plantation are the end result of a Seminole attack during the Florida Wars of 1836.

St Bernard de Clairvaux Episcopal Church, better known as one of the oldest European buildings in the Western Hemisphere.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

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

A mysterious castle built as a monument to lost love.

Possibly the most beautiful carillon in the world, set atop Iron Mountain in Florida.

The only swimming pool listed on the National Register of Historic Places is emptied and refilled each day with naturally filtered water.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

Wild lights and sound effects turn a walk through some caves into an eye-popping 1960s tourist attraction.

This woodland architectural installation acts as a camera obscura for the heavens.

This once-palatial plantation may have been the site where a draft of the Declaration of Independence was written.

The highest point in Virginia can only be reached by passing through ponies and flowers.

The ruins of this Thomas-Jefferson-designed mansion have been left to crumble since the Christmas Day they burnt down.

The oldest living tree in Manhattan comes shrouded in sinister legend.

Long the exclusive domain of birds and vagabonds, this little-known Central Park peninsula is open to the public once more.

A quiet and contemplative oasis in the middle of New York's bustle and riot.

The original toys that inspired the beloved children's stories are on display at the New York Public Library.