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

The "dragon babies" of southeastern Europe.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

A miniature train-ride through Slovenia's largest cave system.

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

The memorial stands at the intersection of the rivers Morava and Danube.

This Slovakian statue of an emerging sewer worker might just be a bronze peeping tom.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

A musical instrument played by the sea.

This seven-sided Romanesque chapel is regarded as the oldest building in Rovinj.

One of the best-preserved Roman amphitheaters is still used today, but for less brutal events.

A whimsical bridge adorned with decorative dragons.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

This home designed for chocolate magnate Antoni Amatller is an exquisite treasure-box of Catalan Modernism.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

In one of the smallest countries in the world stands an original Salvador Dalí sculpture.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

One Portuguese poet described this cape, the westernmost point in mainland Europe, as "where the land ends and the sea begins."