This ancient structure appears Roman, but was constructed during the 16th century and was utilized until 1911.

These natural cliffs look like they are a part of an old castle complex.

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

One of the most important fortresses along the Danube now lies in ruins.

Stone age urban planning.

A Roman monument to their own civil engineering prowess.

A giant portrait of an ancient king looms over the river.

This 14th century castle withstood years of battle but is now sliding off the hills into the Danube.

A NATO bombing took the lives of 16 civilians in 1999—the ruins remain in the center of Belgrade.

Memorial to the 89 children killed during the NATO bombing of Serbia.

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

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

In the hometown of the Catholic saint and Nobel Peace Prize winner, a memorial dedicated to her legacy.

Structure built from the skulls of vanquished foes.

These abundant, over-the-top monuments are so widely scattered that they define the entire compact capital cityscape, often leading to jokes about whether there are more statues than residents.

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

A tribute to an iconic act of defiance from the Croatian War of Independence involving a small car.

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

These warring psychedelic crags commemorate an unsuccessful military operation.

A star-shaped fortress town fort built in the geometric model of the Renaissance utopian city.

Centuries ago, red and white wine poured from the statue's breasts whenever a new Venetian ruler was elected.

An Orthodox church built by the Royal Family for the Russian community exiled to the French Riviera.

One of the world's oldest working clocks is curiously missing the Zodiac sign of Libra.

The oldest botanical garden in the world that technically isn't the oldest.