This ruined fortress was the stronghold for a persecuted medieval leader and his infamous Assassins.

The names Lúthien and Beren can be found inscribed on the shared grave of the famous writer and his beloved wife and muse.

Someone left a Boeing 737 in a field in southern Bali.

Three rooms of bones, curios, and one artist's collection of natural artifacts create this intriguing museum.

This secret collection of the strange and occult was rediscovered in a forgotten room of an old house.

Deep in a Polish forest, this collection of Iron Age megaliths still holds onto many of its ancient secrets.

A floating underwater hotel, created by a Swedish artist.

The main gates have been locked since 1745 and will remain so until the Stuart Dynasty returns to the throne.

A seemingly desolate park that belongs to two countries actually supports all kinds of wildlife.

A stairway to heaven, or to nowhere at all.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

Spiral alpine structure provides an alternative experience of viewing the Matterhorn.

Conspiracy theories and occult legends surround this mysterious natural rock formation.

Double spiral staircases are not unheard of, but they are very rare.

A tiny, remote island packed with wonders both natural and geeky.

A former steam-powered mill from the 1800s is now an industrial park with a giant steel dragon slide.

This Funeral Hearse Museum represents the finest in cadaver transportation.

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

Bask in the 19th century grandeur of an eccentric Freemason millionaire's private gardens.

Week-long block party becomes a competition for the best decorated street.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

A beautiful but toxic fountain of mercury.

This semi-secret storybook hedge maze is also the oldest garden in the city.

This Tuscan church contains a gallery of over 700 ex-votos depicting near-death experiences.