Croatia's "hairy stone" fortress is one of the most well preserved Istrian castles.

A unique two-level bridge designed to honor a king.

The only gulag ever to exist in socialist Yugoslavia.

This huge metal monument is slowly being stripped to its concrete skeleton.

Humble beginnings for one of the world's most famous scientists.

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

This picturesque medieval monastery guards a small trove of historic treasures.

Large, airy hallways hide within an impenetrable fortress that beckons urban explorers.

Formerly Yugoslavia's "forbidden island," this sleepy little city still holds the abandoned remains of military strongholds.

When Croatia became independent of Yugoslavia, the splintering governments left behind these concrete tunnels.

The oldest arboretum on the Dalmatian coast doubles as the gardens of Kings Landing in "Game of Thrones."

This Croatian island is for sale but no one is buying due to the dozens of accused Nazi sympathizers who were massacred there after WWII.

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

A medieval bridge stretches over a sulfur-rich river that leads to year-round natural hot springs.

Ancient Greek oracle of the dead.

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

This unique structure allowed boats to bypass underwater mine barriers in the channel to enter the harbor.

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

A full figure 4th century incorruptible saint lies in a glass coffin in Croatia.

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

Longest fortress system anywhere in Europe.

This Croatian fairytale castle is slowly falling apart thanks to years of neglect.

The complex has been abandoned since the Croatian War of Independence, barring a stint as a set for 'Game of Thrones.'

The remains of a sunken military ship wreck visible through clear water.