Hidden within this iconic mountain are a set of World War II bunkers once used by German forces.

An abandoned brutalist monument whose history has been lost to the ages.

A bridge destroyed three times: once as a ruse, then in an actual attack, and finally for the movies.

This abandoned airplane hanger is said to have once been a top secret launch facility.

This abandoned Olympic skiing facility still bears the scars of the Siege of Sarajevo.

This brutalist monument is inscribed with 9921 names of Yugoslav partisans who perished during WWII.

These warring psychedelic crags commemorate an unsuccessful military operation.

This top-secret nuclear bunker hidden in a Bosnian mountain has been converted to a modern art exhibition space.

This museum preserves the hand-dug tunnel that kept Sarajevo afloat during the Serbian siege.

The haunting ruins of a military fortress turned astronomical observatory sit on a Sarajevo mountaintop.

A war-torn Olympic relic is being overtaken by graffiti and nature.

This cluster of little wooden huts once ground local farmers’ wheat into flour during the days of the Austro-Hungarian Empire.

Former military fort and site of untold horrors during WWII, this island may become the Adriatic's next luxury resort.

This World War I fortress is the perfect place to catch a Montenegrin sunset.

A small island abbey is the final resting place of many medieval Scottish monarchs, including the real Macbeth.

The last inhabitants of one of the U.K.'s most remote islands were evacuated in 1930.

The ruins of this gorgeous clifftop castle look like something from a fantasy novel.

This castle was established by the 4th Duke of Montrose and is connected to the Buchanan Clan.

Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

Amazing and mysterious Neolithic settlement on Scotland's Orkney Islands.

"Respectful to the dead, safe and sanitary to the living, dedicated to the Genius of Memory..."

Spend the night in this formerly abandoned traditional Scottish village.

A strange rock with a sinister reputation lurks within the crimson waters of this Scottish glen.

An ancient Scottish rock formation said to be the gravesite of a giant remains ensconced in legend and intrigue.