This narrow coastline trail through the dense Kauai wilderness is among the most beautiful and dangerous in the world.

A tunnel of hardened lava along Maui’s famous Road to Hana.

This offbeat trailer park is home to vintage peddlers, local artists, indie makers, and more.

These aggressively sustainable art homes look like something out of 1970's science fiction.

A multi-storied adobe complex has been inhabited for more than a thousand years.

A unique geological area spiked with wind-carved rocks that resemble teepees.

A small metropolis of Pueblo cave dwellings have been carved right into the hillside of this national monument.

Wedding chapel's mysterious spiral staircase said to be miraculously constructed.

This southwest-styled home in Santa Fe claims to be the oldest house in America thanks to an ancient bit of foundation.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

The world's spiciest ice cream comes from Glasgow.

This king penguin is a knighted brigadier of the Norwegian Army.

The elaborate clockwork contraptions in this Scottish gallery create small worlds of whimsy and horror.

A strange rock with a sinister reputation lurks within the crimson waters of this Scottish glen.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

A 30-acre garden inspired by the principles of modern physics.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

These fantastically named natural pools look like something out of a Scottish myth.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

Formerly Yugoslavia's "forbidden island," this sleepy little city still holds the abandoned remains of military strongholds.

When Croatia became independent of Yugoslavia, the splintering governments left behind these concrete tunnels.

An ethereal glowing blue ocean cave in Croatia.

An eclectic art form practiced by untrained masters is celebrated at this museum in the heart of Zagreb's old Upper Town.