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

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

This unique structure allowed boats to bypass underwater mine barriers in the channel to enter the harbor.

The interior of this church has been turned into a memorial to locals who died in Croatia's Homeland War.

An apparition of Virgin Mary in Herzegovina.

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

Carefully reconstructed after the Bosnian War, this 16th-century bridge stands as a symbol of the country's enduring multicultural heritage.

Bridge that died in war and was resurected.

This Croatian fairytale castle is slowly falling apart thanks to years of neglect.

A tiny chapel and burial site lurk underground in Jajce.

A 16th-century mosque rebuilt after wartime devastation.

This modern, multimedia museum takes visitors on an evolutionary journey back in time.

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

The first mosque in the world to receive electricity.

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

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

A forgotten and crumbling Yugoslav monument to the victims of fascism.

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

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

The remains of the last Bosnian fortress to fall to the Ottomans are still standing.

This historic cemetery was inaccessible for several years due to dozens of land mines.

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

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

There's a mini version of Iguazu Falls hidden in the Balkans, and it's got a rope swing.