This fantastical icy castle is built anew every winter.

The world's first and only three-segment bascule bridge folds up into the shape of a capital "N" to let boat traffic through.

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

The Guardian of Tallinn.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

One of Catholicism's four major basilicas has a series of papal portraits that are said to predict the end of the world.

The yawning maw of this pagan visage is said to bite off the hands of liars.

Roughly 17 million letters to Santa have found their way to this Arctic Circle post office.

If you visit Santa's village, you can get your passport stamped to show you crossed into the Arctic Circle.

At the very tippity-top of Europe is a cliff from which you can view the midnight sun.

This disused church, left to the elements of the Arctic Circle's forests is open for exploration.

A beautiful Arctic museum and nature center preserves the culture of the Sámi people.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

Tiny memorials honor individual victims of the Holocaust.

A restaurant and observation deck built in a unique broadcasting antenna.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

Stockholm's narrowest alley is barely over two feet wide.

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.

Sweden's "good old days" painstakingly re-created in a model village.

It houses the remains of a 17th-century version of the Titanic.

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

The last permanent exhibit dedicated to the Soviet leader.

An abstract monument to a symphonic composer.

This irregularly shaped sea fortress has defended not one but three different sovereign states.