A small self-proclaimed micro-state located on a piece of disputed territory between Croatia and Serbia, near Liberland.

This only museum in the world dedicated solely to mushrooms.

Inside this small chapel tucked away in the forest is one of the most well-preserved Danse Macabre frescos.

Island wonderland for communist autocrats.

This Croatian computer club features such gaming relics as the infamous Virtual Boy and an 8-bit Pacman machine.

This beautiful Croatian fortress is haunted by legends of forbidden love.

The Renaissance-era courthouse is a relic from the fortified town's centuries of Venetian rule.

A forgotten monument to Yugoslavian freedom.

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

A self-proclaimed libertarian micro-state on a tiny bit of disputed territory between Serbia and Croatia.

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

An eclectic art form practiced by untrained masters is celebrated at this museum in the heart of Zagreb's old Upper Town.

The only gulag ever to exist in socialist Yugoslavia.

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

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

A tower marking the spot where Yugoslavia began its resistance against the invading Nazis stands neglected, but not quite forgotten.

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

Croatia's towering concrete blossom grows from the site of a World War II concentration camp.

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

The now-overgrown beach resort was once frequented by Yugoslav military elite.

This former estate of a fascist leader is now a burnt out ruin leading to a system of secret tunnels.

A wunderkammer of gold and silver reliquaries and ancient saintly bones.

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

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