Austria's ultra-modern art museum looks like Cthulhu's giant alien heart.

The first modernist church in Europe.

Royals, rebels, and artists have all conversed at this grand 19th-century Viennese coffee house.

A non-stop elevator ride in Vienna's city hall.

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

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

The world's oldest known salt mine.

Resting in the middle of an Austrian river, this sci-fi "island" lets people cross in neon style.

This museum is dedicated to the little known ancient Roman history of Vienna.

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

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

Visitors dip into a variety of pools of what was once ice.

Double spiral staircases are not unheard of, but they are very rare.

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

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

An exquisite Baroque church in Vienna's old town.

An Austrian house of bones filled with hundreds of intricately painted skulls.

The solemn exterior conceals an opulent interior of this 17th century church.

A centuries old castle atop a dormant volcano houses museums devoted to both women and witches.

The largest ice cave in the world is thought to be the entrance to hell according to Austrian legend.

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

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

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

The Habsburgs' royal collections of art and wonders.