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

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

Colorful concentric circles honor a small Croatian town's supposed spot at the nucleus of it all.

A forgotten monument to Yugoslavian freedom.

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

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

The only gulag ever to exist in socialist Yugoslavia.

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

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

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

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

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

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

Yugoslavia's biggest underground airport lies in ruins.

This stunning, out-of-the-way Croatian monument commemorates a community's uprising against occupying fascist forces.

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

A musical instrument played by the sea.

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

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.

One of the few remaining examples of 19th-century London’s attempt to clean up its reputation.

The first geometric self-supporting spiral stairs in Britain are a truly beautiful sight.

This pump on the bad side of Victorian London betrayed a horrifying revelation about the water supply.

"We gonna rock down to Electric Avenue, and then we'll take it higher..."