The Bauhaus-style former industrial complex is considered the world's most beautiful coal mine.

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

This contentious squat has stood through fire, violence, and government intervention as a hotbed of leftist protest.

Hamburg's first legal sex work is relegated to a gated street that still does not allow pedestrian women.

A fountain standing as a testament to a doomed alliance.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

A marvel of Byzantine engineering under the streets of Istanbul.

Collection dedicated to funeral rites, equipment, and mourning rituals of the Viennese.

Giant WWII fortresses that fired 8,000 rounds a minute, now home to thousands of pigeons.

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

Apartment complexes built into huge repurposed natural gas tanks.

A small museum filled with over 1,000 clocks, and one particular clock calibrated to run until the year 9999.

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

The house that took a plunge into the facade of a museum.

Legends surround an ancient tree trunk riddled with nails for good luck.

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

The beautiful baroque library of the Hapsburg empire.

The final resting place for the remains of 143 Habsburg royalty.

Macabre astrological automaton clock dating to the late 1400s.

A volcanic old faithful, Stromboli has been erupting continuously for the last 2000 years.

A spherical "micro-nation" in the heart of Vienna.

A forgotten remnant of the Soviet Union, Transnistria is an unrecognized country hidden behind a heavily militarized border between Moldova and Ukraine.

Located right outside of Vienna, visitors can take in expansive views of an ethereal forest.

Austria's very first and only nuclear power station was completed but never used.