In the Scottish Highlands, this 13th-century castle ruin is hidden at the end of a farm track.

This cauldron was said to be hidden inside a church after it was borrowed from a local witch.

Beneath an ancient wishing tree lies an underground chapel with 12th-century frescoes and catacombs dedicated to a lady saint.

Spectacular mineral formations fill these caves, which have been used for everything from smoking meat to stashing illicit liquor.

This massive subterranean fissure is known as the "underground Grand Canyon."

This ruined fort and statue are a testament to the last king of Kaua‘i’s savvy diplomacy skills, which briefly brought Russians to Hawai‘i.

More than 100 antique vending machines housed in a used tire shop sell everything from candy to sake and ramen.

This 20th-century replica of a 13th-century castle has itself fallen into ruin.

A folk-art cottage and hotel straight from a Slavic fairy tale.

A grueling 699-step stairway to a heavenly view of the island of Saint Helena.

With no menu and no sign, this 130-year-old taverna doles out affordable home cooking.

A former drinking water storage reservoir transformed into a sunken garden.

A unique Buddhist temple with strange statues, beehives, and dinosaurs.

This magical grotto is adorned with a complex pattern of native seashells, minerals, and fragments of colored glass.

Why walk on this historical site when you can zoom down instead?

When the sun sets, the customers arrive—but they’re not human.

Nose around a unique collection of more than 300 natural aromas used to craft fragrances.

This enchanting hill is home to fairy lore and a sinister local mystery.

It's safe—and permitted—to walk across these twin natural sandstone arches.

Egyptian Revival movie palace abandoned for decades and restored in 2013.

The elaborate façade of this old Cantonese opera house celebrates the building's history and the love story that founded it.

The final resting place of one of the United States's greatest poets.

A dozen U.S. presidents have stayed at the historic resort, which was known as James Buchanan’s “Summer White House” from 1857-1861.

Enjoy the waters of this half-moon-shaped natural pool surrounded by breathtaking scenery.