Twisted buildings adorn the banks of the Rhine river.

How did a lighthouse wind up in the middle of this landlocked German city?

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

A museum that chronicles the history of the Nuremberg Trials for Nazi war criminals in the building where the trials were once held.

A castle from the Holy Roman Empire that hosts traveling youth... in its stables.

An abandoned train station in Munich constructed for the 1972 Olympic games.

Go surfing on this urban wave, "hacked" by local surfers.

These bronze pamphlets remember a remarkable group of Germans who fearlessly opposed the Nazis in the very center of their power.

The footprint of a frustrated devil in Munich's Cathedral.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

The patron saint of spinsters grasps a container of dried blood.

A moving memorial to the fallen and missing from WWI trenches.

A rare example of World War I trenches from the British front.

The spectacular and eerie moss-covered grave site of 19th-century Belgian merchant.

The complex has been abandoned since the Croatian War of Independence, barring a stint as a set for 'Game of Thrones.'

In the middle of a Vienna square, Roman ruins dating back some 2,000 years are on display.

This series of Baroque passageways in Vienna's cultural center mix old architecture with modern art.

Baroque celebration of the end of the Great Plague of Vienna.

The former private quarters and office of Dr. Sigmund Freud now hosts a museum housing the works of the founding father of psychoanalysis.

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

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

An iconic Soviet statue of working-class people.

Gargantuan home of Russian science.