A spectacular cave and a beguiling lake.

A small but immensely extravagant palace built by the "Night King."

Hiding the longest subterranean river known in the world.

The world's highest and most dangerous infinity pool lies at the precipice of Victoria Falls.

A mythically themed self-built sculpture park.

A musical instrument played by the sea.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

The ravine where Jesse James supposedly performed an impossible jump to evade capture.

A glacier pocked with ice caves and surrounded by rainforests.

The artist James Turrell is repurposing an extinct volcano crater as an observatory to experience the cosmos.

An Italian geologic wonder that served as the inspiration for the landscape of Dante's hell.

European castle ruins in an American state park are actually the product of death and grief.

A colossal floating restaurant built to look like a ancient Chinese imperial palace.

Underneath a chalk hill in France lies what Hitler hoped would be the underground launching base for a devastating new weapon.

A centuries old castle atop a dormant volcano houses museums devoted to both women and witches.

Largest island in the Baltic Sea experiences such idyllic weather that roses bloom in the middle of December.

A wacky two-story folk-art assemblage of carved and found objects, with lights, motion, and sound now in need of financial support.

An abandoned Santa park is as far as this proposed theme park kingdom got toward completion.

These molds for fiberglass statues have formed an eerie, accidental sculpture park.

Japan's corrupt-mental-institution themed restaurant offers diners a chance to eat inside of filthy cells.

The oldest working mechanical clock in the world.

A small museum filled with over 1,000 clocks, and one particular clock calibrated to run until the year 9999.

Each spring, a dreamlike carpet of bluebells overtakes the forest floor.

The world's largest natural arch was forgotten for over 50 years after its discovery.