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.

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

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.

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

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

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

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

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

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

This truly palatial work of Communist-era architecture now sits crumbling on a Croatian beach.

Yugoslavia's biggest underground airport lies in ruins.

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

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

An ethereal glowing blue ocean cave in Croatia.

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

This magnificent Crimean estate was once a playground of the Russian elite.

This space age health spa looks like a supervillain's lair.

In the land of the Light Brigade stands a testament to the Cold War.

One of the windiest peaks in Crimea is home to an incredible set of cable bridges.

The saltiest lake in all of Crimea is also the pinkest of the pink and teeming with life.

A castle perched precariously over the Crimean Sea.

A decaying, yet still functioning, work of communist architecture.