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

Designed as a reminder of one of the darkest moments in Austrian history.

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

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

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

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

Op-art architecture designed for happiness.

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

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

A mechanical clock built in 1914, with a rotation of 12 historical figures on its face.

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

The topiary maze at the Habsburg hunting lodge.

These two 15th-century metal rods allowed people to check if they were swindled or not.

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

This Belgian observatory bears a striking resemblance to Futurama's Planet Express building.

This massive underground salt mine now holds a sci-fi theme park in its depths.

A massive, gleaming sea turtle with a rider atop its shell looks out over the horizon.

Rediscovered in 1992, this abandoned medieval village once flourished by fishing and piracy.

What was once a bustling mining installation is now a bustling hub of contemporary art.

This bike path was sunk below water level for maximum wonder.

This giant urban staircase was built to keep the city's brave fighting men from getting waylaid in the red light district.

This 18th-century folly is one of Europe's rare "garden mosques."

In this German city center, the streets have no names.

A preserved college lock-up that recalls a clubhouse approach to discipline.