Places Sputnicktatorship Wants to Go

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

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

Built as an anti-fascist tribute, this surreal Yugoslav memorial became an unwelcome symbol after the Croatian war for independence.

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

This heart-shaped island looks substantially less lovely after a recent bulldozing project.

This abandoned Croatian stronghold never saw a great deal of conflict but it is still a beloved relic nonetheless.

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

A forgotten monument to Yugoslavian freedom.

Now abandoned, the world's first torpedo factory is crumbling into the sea.

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

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

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

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

Longest fortress system anywhere in Europe.

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

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

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

Once a state-of-the-art tuberculosis treatment spa, these ruins are now ruled by paintball players.

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

Legend has it fairies gathered at the site of this medieval castle.

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

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

Yugoslavia's biggest underground airport lies in ruins.

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