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

Celebrated example of Ottoman architecture that also served as a site for brutal massacres.

Despite being pillaged and destroyed a number over times down the centuries, this historic church still sort of stands.

Operating continuously since 1903, this "milestone" facility transformed the regional economy.

Popular river that runs through the remote Serbian municipality of Leskovac.

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

A Roman monument to their own civil engineering prowess.

A sinuous path among steep cliffs creates a stunning sight in southwestern Serbia.

Structure built from the skulls of vanquished foes.

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

For over 40 years, this quaint little house has teetered on a rock in the middle of a river.

A Red Cross memorial museum at the site of the Niš concentration camp that operated for four eventful years during World War II.

A grand Yugoslav memorial to the group of partisans who fought and died resisting western Serbia’s Nazi occupation.

In the hinterlands of Serbia's capital, a giant reflective mushroom houses an aeronautical history of the former Yugoslav republic.

Stone age urban planning.

Destroyed Serbian army headquarters sits half crumbled in a largely revitalized Belgrade.

Nikola Tesla's ashes are held in a golden sphere, surrounded by his works.

A misnamed well, with a deep dark past.

A towering spire in the fortress of Kalemegdan honors the victorious armies of Serbia during their struggles against the Ottoman Empire.

A Serbian church lit by chandeliers made of weapons.

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

A tribute to a man who defied the Nazis until his last breath.

This symbol of Yugoslav liberation decorated with 620 carved heads of mythical creatures is now a forlorn relic of another time.

Serbia's master of striking memorials erected a forgotten, hidden gem in the hills outside a tiny village.