One of only two pod-shaped homes designed by Frank Lloyd Wright.

Pensacola's UFO home has withstood many hurricanes—just as the experimental 1960s design intended.

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.

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

A perfect circle of twenty-four mysterious holes dates back to prehistoric time.

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

Florida castle built with aluminum printing plates.

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

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

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

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

This architectural triumph is the only Frank Lloyd Wright house in Alabama.

A master plumber has turned his love of art and toilets into a folk museum that's not taking the piss.

A Texas-sized particle collider that was abandoned due to its Texas-sized budget.

This crumbling UFO is one of only a few remaining "moveable ski chalets" of its kind.

An engraved boulder marks the spot where Patsy Cline's life ended in a plane crash.

This ancient Irish landscape boasts hundreds of legendary ruins.

The world's toughest modern Christian pilgrimage leads directly to the gates of Hell.

The ancient tomb acts as a calendar that keeps perfect time.

Dublin's most modern, visually spectacular bridge is modeled after Ireland's national emblem.

This natural sea arch highlights Ireland's rugged coastal beauty.

An Irish peat mine has become a stunning sculpture park.

The world's tallest box hedge is found in a delightful garden.

The largest portal tomb in Europe has a capstone weighing around 150 tons.