The stately remains of Llywelyn the Great's mighty fortress.

This beautiful natural train tunnel is said to grant the wishes of visiting lovebirds.

World's oldest and largest space launch facility, once a secret missile testing site.

An architectural oddity of six stories, accessed by graceful ramps.

Piano-making empire filled with 200-year-old steam machines still churning out 1,000 instruments a year.

This floating garden in the sky is straight out of a fairy tale, but the real thing is nothing short of magical.

Carved by a waterfall in a hard-to-reach rock formation, this heart-shaped rock has inspired romantics for decades.

Walk in the footsteps of the gods and straddle two tectonic plates.

Montreal's giant farmer's market is a foodie's best friend, especially in the winter months.

The gloomy ruins that inspired Bram Stoker to bring Dracula to life.

An 18th century wonder of the world, lost in WWII, re-created at the Catherine Palace.

The highest waterfall in Italy is only "turned on" five times a year.

The Origin of On the Origin of Species.

White beach sands made of the remains of tiny, star shaped creatures.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

An amazing clockwork museum in the Val de Travers holds examples of various prestigious legacies horological history.

Hitler's bleak vision of relaxation still stands as a mostly abandoned 10,000-room resort complex.

A tradition unlike any other, this marks the site of the annual Groundhog's Day tradition.

Behind the pink curtain, Au Bonheur du Jour, an art gallery of erotic archives.

A museum and doll store featuring a surreal and super sanitized version of where babies come from.

The real life Hobbiton, this sheep farm has been forever transformed since being built for The Hobbit film series.

Largest cave system in Africa.

A cave network located at the southernmost tip of mainland Greece was once believed to be an entrance to Hades.

Wondrous stalactites house thousands of bats in these African caves.