Different sections of the Zemun Fortress were built in the 14th and 15th century as a response to the advance of the Ottoman Empire.

A well-worshipped shrine to the Virgin Mary nestled inside the last of Zagreb’s historic gates.

Each year melting snow turns these Austrian hiking trails into scuba zones.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

A museum capturing one of the world's most famous classical composer's battle with hearing loss.

A set of outdoor stairs named in honor of a famous Austrian artist.

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

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

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

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

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

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

Vienna's underworld of tunnels and subterranean rivers made an iconic appearance in a 1949 Orson Welles film.

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

An exquisite Baroque church in Vienna's old town.

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

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

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

Thousands of slain Soviet soldiers are buried within the shadow of this enormous obelisk.

Often mistaken as a medieval Gothic monument, this unique cornerstone only dates back to the 1980s.

The largest fountain in Bratislava.

A line of disused military bunkers built to defend against Nazi invasion lies hidden on the outskirts of the city.

The inverted pyramid design of this station stands out amid Bratislava's urban landscape.

A sculpture of the beloved author surrounded by characters from his fairy tales.