Northern Ireland's Brobdingnagian stepping stones.

The first declared National Monument in the United States.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

Here, at the "world's longest art gallery," you'll find forty miles of ancient petroglyphs and pictographs.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

There is no trying to fall in love with this Star Wars fountain, you just do or do not.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

This massive library holds what was once the largest book collection in the world.

Two stunning 17th-century libraries and a cabinet of curiosities.

A submerged archeological park still holds the wonders of a Roman Sodom.

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

Rising from the sea like a stone monster.

The atmospheric road was never meant to be so creepy.

Macabre astrological automaton clock dating to the late 1400s.

The real life Hobbiton, this sheep farm has been forever transformed since being built for The Hobbit film series.

The final resting place of New Orleans' most famous voodoo priestess.

This volcanic cave lake is essentially hard proof that Iceland is the most magical place on Earth.

Fine dining in the bizarre world of Lewis Carroll.

An Australian lake whose pink hue defies scientific explanation.

A winding path built in secret on the edge of the continent.

Famously misunderstood wonder of the ancient world

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

The old Niles Canyon Aqueduct in the San Francisco Bay Area is a bemusing and secret trail through nature for wayward travelers.

Resting place of Hollywood's immortals is also site of summer film screenings.