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

When the town wouldn't allow the fast-food behemoth to build a new restaurant, they put one inside an 1850 home.

A tunnel with windows, so you don't miss out on the impressive views.

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

In a 345-million-year-old cave that's 200 feet underground, dinner awaits.

Drink a Guinness under the wings of Reagan's retired Air Force One in his presidential library.

This angular Dwarven tunnel cuts through a mountainside in Glacier National Park.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

This remote desert watering hole has a connection to a curious chapter of American history.

An abandoned town is hidden in Great Smoky Mountains National Park.

A 19th-century cabin built into a hollowed-out Sequoia tree.

These millipedes glow not out of attraction, but as a not-too-subtle warning.

The atmospheric road was never meant to be so creepy.

This tiny train shuttles passengers to one of Northern Ireland's most spectacular sights.

Hidden in the Santa Ynez Mountains off Highway 154, this tiny restaurant once served as a stagecoach stop.

A popular swimming hole that hides one of America's most deadly diving spots.

What was once the second largest steel mill in the US is now a sprawling complex of modern ruins.

A century-old network of freight tunnels underneath the city's historic business district.

The restored estate of a wealthy rancher was once at the heart of an unprecedented legal victory.

A poignant memorial to a young boy whose death spurred a dramatic increase in organ donations in Italy—dubbed the "Nicholas Effect."

The simple log cabin of a famed loner and naturalist stands preserved as a symbol of the ultimate DIY lifestyle.

This stunning home looks like it belongs in medieval Europe, not North Carolina.

Eat a tasty meal in the house where John Steinbeck was born.

The only runway directly into the magic kingdom has been closed since 1972, but it still sings to you if you drive fast enough.