The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

Seemingly grown on some other world, these New Mexico rock formations look like a disused science fiction set.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

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

One man has carved a number of natural New Mexico caves into psychedelic sandstone temples.

Private collection of art inspired by cabinets of curiosity.

At this deceptively beautiful beach, nothing is what it seems.

This museum inside a museum tells the story of London's timepieces.

One of the world's oldest working clocks is curiously missing the Zodiac sign of Libra.

Travelers who fall victim to this mermaid's charms are destined to stay in Užupis forever.

William Blake claimed to have painted this gothic masterpiece after encountering this nightmarish being in a vision.

Every year, the colorful murals of Montreal get a complete makeover.

The only urban monument in the world designed by the great surrealist painter Salvador Dalí.

Mysterious Incan ruins on a tiny island in Lake Titicaca.

Legend has it fairies gathered at the site of this medieval castle.

The oldest surviving glass furnace cone in Western Europe.

The city of Palestrina was built around this magnificent terraced sanctuary dedicated to the pagan goddess Fortuna.

Islanders once used this dramatic, otherworldly landscape to hide their cattle from Viking raiders.

Large-scale contemporary artworks tower over fields and lurk in forests around a Jacobean manor house.

A forest park outside Tallinn full of architectural and artistic curiosities.

The largest puppetry museum in the United States houses the world's most complete collection of Jim Henson artifacts.

This collection of 80 polarizing foods aims to challenge your subjective notions of repulsion.

An ancient Scottish rock formation said to be the gravesite of a giant remains ensconced in legend and intrigue.

One of the largest cat sanctuaries in North America is considered a "Club Med" for felines.