Macabre astrological automaton clock dating to the late 1400s.

This artificial cave looks like something out of a fairytale.

A steampunk-styled three-floor factory churning out art, activism, and electronic beats.

This spaceship sculpture in the middle of the Slovakian capital looks like it just crash-landed.

This Slovakian statue of an emerging sewer worker might just be a bronze peeping tom.

Brass plaques embedded in pavement preserve the memories of those who lost their lives at the hands of Nazis during World War II.

A cableway for car transport.

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

A gift from Emperor Franz Joseph I to his wife.

The first modernist church in Europe.

Apartment complexes built into huge repurposed natural gas tanks.

An ornate private entrance to the Vienna subway built specifically for the emperor.

The housing complex served as an anti-fascist fortress during the Austrian Civil War.

The topiary maze at the Habsburg hunting lodge.

More than a millennium's worth of municipal records preserve the political history of Austria.

Inside the corridors of this flea market, visitors are sure to find some obscure and odd treasures.

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

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

Along the edge of this fountain are 365 smaller fountains that represent the days of the year.

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

These relics of the city's past now exist as a prominent modern feature.

An exquisite Baroque church in Vienna's old town.

On a winding Vienna side street, one museum has turned their windows into a monument to history’s peace-minded heroes.

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