This 19th-century prison once held Irish revolutionary Constance Markievicz, writer Frank O’Connor, and a nine-year-old pickpocket.

Martin Bricelj Baraga's monolithic sculpture measures the blueness of the sky, and changes color to match it.

Strange rumors surround the artist who created these solemn metal guard dogs.

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

A whimsical bridge adorned with decorative dragons.

When this monument to Slovenia's national poet was erected, it's said to have sparked the ire of nearby church authorities.

A public work of art that also provides some relief from the summer heat.

A trough of 700 strange bronze faces runs through a narrow alley in Ljubljana's old town.

One of the very few mosques built by the Ottomans still standing in Croatia is now a Catholic church.

This ancient Roman aqueduct once funneled water to Diocletian's palace.

Construction of this bridge was once described as an "act of violence" against a neighboring country.

When a supermarket opened up shop within a medieval building it became protected by UNESCO on a technicality.

Split's smallest church, and one of its oldest, has been reconstructed inside the city's Roman walls.

The big toe of this towering monument to a Croatian national hero is worn from years of superstitious rubbing.

This 15th-century church houses priceless works of art from a range of Croatian artists.

An ancient knight and a symbol of the city's freedom.

Gargoyle head that brings good luck.

Picturesque basketball courts sheltered by historical defensive walls and with an enviable sea view.

This work of art is considered the world's longest mosaic.

A curious little museum dedicated to the furry feline in the cat haven that is Old Town Kotor.

An underground city of salt.

Extremely famous in his native country, this Cracovian painter is all but unknown beyond Polish borders.

Remnants from a time before electricity.

Inside this Krakow church, an explosion of psychedelic color.