Icelandic folklore says this giant boulder was ripped from the mountains and placed at its current location, where it became home to elves.

The oldest hall in Iceland was written of in the Sagas and features a centuries-old escape tunnel.

An encyclopedic collection of mammal penises.

Iceland's "Smoky Valley" is a beautiful river that is shrouded in a constant cover of steam clouds.

Iceland's largest lagoon is home to stunning multi-colored icebergs.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

This fantastical waterfall is hidden in a cave located in a cracked cliff.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

The mark of the Devil's horns on a marble column in Milan.

Small on the outside, big on the inside, this church is an astonishing act of visual deception.

This giant middle finger statue sends an unambiguous message to Italy's bankers.

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

Latvia's symbolic mountain-shaped national library is home to millions of cultural tomes.

A former Latvian headquarters of the brutal KGB secret police is now open as a grim reminder of their atrocities.

This Russian museum stresses the importance of keeping clean and even holds one of Pavlov's dogs.

Palace where the nearly un-killable Rasputin was murdered.

The oldest museum in Russia is home to a fascinating collection of nearly two million anthropological artifacts and anatomical curiosities.

Bullet holes in the church wall are a reminder of the violence that followed the assassination of a high-ranking Nazi officer.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Two stunning 17th-century libraries and a cabinet of curiosities.

Macabre astrological automaton clock dating to the late 1400s.

An old department store turned Nazi prison turned artist commune.

One of the world's heaviest musical instruments towers within a popular urban park.