This virtually windowless mass of smooth concrete is the only Catholic church in the city.

Its frescoes depict the likeness of Marshal Tito, Karl Marx, and Friedrich Engels burning in hell.

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

A little sculpture with a large wardrobe.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

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

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

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

One of the most notable figures in the Wurstelprater’s history is often assumed to be a fictional character.

A neo-Gothic mansion now houses a wunderkammer of analog tech that hits on all the senses.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

Apartment complexes built into huge repurposed natural gas tanks.

This cubist Vienna church building looks like some sort of alien stonehenge.

This grand manse has been transformed into a museum devoted to one of the founders of Fantastic Realism.

The first modernist church in Europe.

Vienna's diversity-themed traffic lights were inspired by the Eurovision Song Contest.

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

Sacred Buddhist home of some spiritual monkeys.

This restaurant is proud to be built atop a burial ground.

The tallest statue in the world is twice the height of the Statue of Liberty.

From prostitutes to soldiers to business men, the dead in this graveyard are a microcosm of Singapore's history with Japan.

The busy transport hub is home to the tallest airport slide in the world.

This statue once earned the distinction as one of the "Three Major Disappointments of the World."

Singapore's oldest Hindu temple.