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

The shell of a medieval fortress offers commanding views of the area it once protected.

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

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

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

A gift from Emperor Franz Joseph I to his wife.

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

The first modernist church in Europe.

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

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

A magnificent collection of imperial armor and weaponry.

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

Visiting this café is like visiting the Austrian grandma you wish you had.

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.

The Habsburgs' royal collections of art and wonders.

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

A neo-Gothic church built to thank God for saving the Emperor of Austria from an assassination.

Beautiful Austrian natural history museum with carved ceilings and row after row of ancient taxidermy.

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

Dine amidst exotic plants at this former royal greenhouse.

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

A tropical paradise just a short trip from the opera house is filled with beautiful winged creatures.

The final resting place for the remains of 143 Habsburg royalty.