The ancient tomb acts as a calendar that keeps perfect time.

Breathtakingly blue walls shimmer inside the "Glacier Behind the Town."

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

Rising from the sea like a stone monster.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

A layered tribute to the work of mosaicist Isaiah Zagar.

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

Yale University's home for rare works, including the mysterious Voynich Manuscript.

A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.

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

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

The world's only museum devoted to the wonders of fluorescence.

An enormous, inside-out glass globe built in 1935.

Staves, storm-calling, and of course, necropants.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

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

A hand-built folk art installation covered with messages of God's love.

A strange house built only at night, with rumored mystic inspiration.

The world's largest collection of witchcraft regalia.

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

Medicinal spa created with the discharge from a geothermal energy plant.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

A church of bones, decorated with 40,000 human skeletons.

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