According to the Guanches, the aboriginal people of the Canary Islands, the king of evil lives inside this volcano.

Peek through a transparent pyramid and drink in the mountain made of books.

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

Home to the world's oldest functioning orrery.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

Hundreds of Buddhas in a re-discovered Indonesian temple.

This tiny lake temple dedicated to a water goddess seems to float on the surface.

Hindu temple of the dead home to hundreds of long-tailed macaques.

Isolated atop this Balinese sea crag is a lovely Hindu temple that is said to be guarded by sea snakes.

Where the lovelorn find a home for their sentimental keepsakes.

The topiary maze at the Habsburg hunting lodge.

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

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

Nikola Tesla's ashes are held in a golden sphere, surrounded by his works.

This historic cemetery was inaccessible for several years due to dozens of land mines.

Oriental bazaar in the heart of Sarajevo.

An underground city of salt.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

Home to the "Rat King" of Nantes and other wonders of the natural world.

A little sculpture with a large wardrobe.

From Tintin to the Smurfs, Europe's greatest graphic icons are celebrated in a grand Art Noveau gallery.

This collection of over 50 murals celebrates Brussels' rich history as the self-proclaimed home of the "comic strip."