A historical puzzle lies at the origins of this structure.

This fortress dates back to the 6th century and is also the site of a controversial abandoned restoration project.

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

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.

A 11-foot former president stands on a Kosovo street that also bears his name.

A futuristic, brutalist masterpiece that is also strangely prison-like.

This massive monument was unveiled the day Kosovo declared independence from Serbia.

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

This building has two facades of clashing architectural designs.

An homage to the medieval rulers of Bulgaria.

Rebuilt several decades ago, its striking murals prevent it from being reconsecrated as a church.

Sofia's legislative center is continuously reinventing itself.

A vast Communist-era exhibition space in the Bulgarian capital.

This sculpture used famed boxer Joe Louis as the inspiration behind its body.

The preserved arm of a third-century sorcerer is believed to have the power to lift curses and spells.

This once-derelict building is now one of the most beautiful bookstores in the world.

This elevator was built in 1907 to connect two neighborhoods separated by a steep, rocky cliff.

The people of Padua pledged to construct this church if the city was spared from destruction during World War I.

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

A twisted steel beam from the wreckage of the World Trade Center is the centerpiece of this memorial for those who died on September 11, 2001.

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

Stuck in the arcade of Casa Isolani are three arrows of mysterious origins.

Over 100 towers were built in Bologna during the Middle Ages, but only 22 survive.

A striking memorial recalls thousands of Bolognese men and women killed fighting fascists in World War II.