A curious cave church carved into the face of a cliff.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

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

Inspired by the Rialto Bridge in Venice, these three clustered bridges were just one part of a Slovenian architect’s grand vision.

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

This abandoned Slovenian military barracks has become a punky-political art squat.

A whimsical bridge adorned with decorative dragons.

This one-time health resort was used by aristocrats around the world.

An excavation site that signified Hercules in Pula, and a glimpse into the city's Roman history.

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

The local club's soccer field is practically surrounded by UNESCO-protected monuments.

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

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

A World War II evacuation tunnel turned into a history display of Croatian state and people.

Now harmless, this looming post struck fear into the heart of medieval troublemakers.

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

This military tunnel dates back to World War II and provides visitors with a little wartime adrenaline.

This scale model of our solar system hid in plain sight for years before a physics team sought out all the planets.

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

A musical instrument played by the sea.

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

Celebrated example of Ottoman architecture that also served as a site for brutal massacres.

A number of craters left by fatal mortar strikes have been filled with red resin to remember those lost during the Siege of Sarajevo.

Oriental bazaar in the heart of Sarajevo.