A mysterious castle built as a monument to lost love.

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

Holding multiple historical boats and an entire 19th century village, this New England attraction is the largest maritime museum in the world.

The kind of mixed-up place that drives archaeologists crazy.

This small-town Connecticut restaurant gives each diner a free book from its vast library.

A futuristic hovertrain is parked unceremoniously alongside a nondescript road.

This razorback ridgeline has doubled as a scenic drive since the early 1900s.

The largest dinosaur trackway in North America is tucked away among this canyon's ghosts and archaeological gems.

A little-known hot spring haven right below the highway.

Even in death, he's still your huckleberry.

The highest paved road in North America winds its way up Mount Blue Sky in Colorado to an altitude of 14,130 feet above sea level.

The highest bridge in America was built for an almost unnervingly small amount of money.

When ecosystems collide in the arid Southwest.

This naturally-sourced hot spring is now home to a clothing-optional resort.

A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

Of all the origin stories for weed's secret code, this one likely has the goods.

Inky sludge oozes to the surface of this beach thanks to a rare natural tar seep.

A Bicycle Path in the Sky.

A second generation sun-powered marvel lights up the night.

Burping, gurgling geothermal mud pots by the Salton Sea.

'Cause the fence start shaking, the earth was quaking.

The peaceful gravesite of a rugged wild west gunman echoes the touching story of his last days.

The hundreds of movies and television shows shot in this high desert town are commemorated in a unique museum.