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

The world's largest historic armory was established by independent citizens to defend themselves from the wars of larger forces.

Fantastic stories on a miniature railroad.

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

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.

An underground city of salt.

As one of the world's largest hydroelectric dams this plant took two countries to get built.

"World machine" built by an untrained Austrian farmer.

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

Apartment complexes built into huge repurposed natural gas tanks.

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

The townhouse where the "Blood Countess" Elizabeth Báthory started her murderous career.

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

A patriotic medieval knight in driven-nail armor raised money for widows and orphans of WWI.

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

Dine amidst exotic plants at this former royal greenhouse.

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

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.

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

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

The first modernist church in Europe.

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