The ruins of this medieval castle on a foggy hill tell the story of a once-mighty empire.

The bizarre rocks of Đavolja Varoš are the result of natural erosion.

The interior of this Serbian royal family's mausoleum is covered with exquisite mosaics.

This spaceship-like Serbian monument reaches for the stars in celebration of the fallen fighters of fascism.

This memorial park stands on the site of one of the largest mass executions of the Second World War.

A Serbian church lit by chandeliers made of weapons.

Structure built from the skulls of vanquished foes.

A tiny chapel and burial site lurk underground in Jajce.

A field filled with carved medieval tombstones called stećak.

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

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

Yugoslavia's biggest underground airport lies in ruins.

A forgotten monument to Yugoslavian freedom.

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

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

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

Trimmed trees grow alongside the graves like topiary tombstones.

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

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

An eclectic art form practiced by untrained masters is celebrated at this museum in the heart of Zagreb's old Upper Town.

This former estate of a fascist leader is now a burnt out ruin leading to a system of secret tunnels.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

A plaque in Madrid’s West Park marks the launch of a queer icon’s unlikely media career.