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

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

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

A rooftop restaurant hides in plain sight atop Vienna's Palace of Justice.

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

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

The beautiful baroque library of the Hapsburg empire.

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

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

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

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

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

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

An exquisite Baroque church in Vienna's old town.

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

A silly medieval mural preserved on the side of a Viennese house.

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.

Dedicated to the man who saved hundreds of children from Nazi-occupied Czechoslovakia.

This walkway is so narrow it needs its own light to stop pedestrian traffic jams.

A grumpy old water goblin guarding an old mill on the Devil’s Stream in Prague.

A plaque marks the spot where the saint was shoved off the Charles Bridge and into the river.

The medieval "Bearded Man" relief still serves as a clever flood warning marker.

A significant example of Czech cubist architecture—a style you won't find anywhere else in the world.