In the days before house numbers, these colorful signs held clues about various buildings' purposes.

Seven mini rowhouses fill the gap between 54 and 70 Westerstraat.

A simple plaque on the facade is the only reminder that the treaty ending the American Revolution was signed inside.

The recovered bones of martyrs slaughtered during The Terror are on display in this church crypt.

The industrial architecture honors the laborers who brought the Exposition Universelle of 1900 to life.

One of downtown Berlin's last reminders of its Communist past.

Teeming with illegal goods and services, this towering maze of vice is also a popular tourist accommodation.

Thousands of abandoned statues of deities are taken to this hillside in southern Hong Kong.

This hulking behemoth is actually five interconnected towers built in the 1960s.

In addition to fine dairy products, the world's most beautiful milk shop also offers a feast for the eyes.

Silent memorial, using bone conduction to take people back to the Dresden Bombing of 1945.

A unique hanging cable-car navigates through Dresden, the oldest suspension railway in the world.

The former home of France's controversial pop maestro is almost completely covered in ever-changing tributes and graffiti.

This former “ante-chamber to the guillotine” has been refurbished to illustrate the brutal history of French justice.

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

A surrealist timepiece by the artist of melting clocks.

A counter-culture bookstore like no other hides in plain sight in the streets of Paris.

Walk upon the mementos of the dead in this Parisian courtyard paved with medieval tombstones.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

Notorious artist squat renovated into legal studios.

Buried five stories underground, this Soviet bunker is packed with gas masks and Cold War paraphernalia.

A Jenga-style cylindrical tower of books that appears to go on forever.

A sculpture of the iconic East German car on four legs is a tribute to those who traveled to Prague seeking asylum.

Monument to a suicide protesting the Soviet invasion.