A UNESCO-protected spiritual seat of the Old Serbian Kingdom and Empire.

A 14th-century Serbian Orthodox church that was once converted into a mosque under the much-disfavored Ottoman Empire.

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

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.

Once a safe haven for locals engaged in blood feuds, this 400-year-old fortified tower is now a museum showing what life was like for those lying in wait within its walls.

What happens when you cross a mayor and a painter?

Once the fallout shelter of a dictator, this sprawling bunker is now a combined history museum and contemporary art gallery.

The oldest olive tree in Greece has been bearing fruit for at least 2,000 years.

This stone tower was built to protect Crete from incoming pirates.

This communist behemoth is the heaviest building in the world and a legacy of a brutal regime.

A striking symbol of the Bulgarian capital.

"Holy Wisdom" overlooks the city that became its namesake.

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

This ancient theater, restored in the 20th century, lives on as a venue for dramatic and musical performances.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

Legend says if you stick your thumb in the hole and it gets wet, your wish will be granted.

A section of the long chain that blocked enemy ships from entering Constantinople.

This column celebrates Rome's victory over the Goths, and may be the oldest Roman monument in Istanbul.

A cluster of historic bathhouses built on the famed hot springs that gave the Georgian capital its name.

A unique museum dedicated to culture and artistry of carpet weaving.

A gigantic collection of teeny, tiny books.

This mysterious but iconic tapered tower appears in many Azeri fairytales and legends.

The world's largest KFC restaurant is housed in a historic railway station in Azerbaijan's capital city