The largest Roman amphitheater in the Balkans once held over 20,000 people, but managed to lay hidden for hundreds of years.

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

An Albanian monument to the Communism that nearly crushed the country is now a crumbling wreck.

What happens when you cross a mayor and a painter?

A museum dedicated to secret surveillance.

In this German city center, the streets have no names.

A haunting contrast of trains that both saved and took the lives of Jewish children in Nazi Germany.

A series of bronze circus performers spread throughout a Slovakian shopping center.

Dedicated to a synagogue that was destroyed after having survived World War II.

According to the local legend, these boys and ducks were turned to stone by an angered water goblin.

Brass plaques embedded in pavement preserve the memories of those who lost their lives at the hands of Nazis during World War II.

Launched by Napoleon's soldiers more than 200 years ago, a cannonball remains embedded in the tower wall.

The inverted pyramid design of this station stands out amid Bratislava's urban landscape.

Bangkok celebrated its shifting monarchy with a militaristic homage to democracy.

A socialist building dedicated to teachers showcases one of the largest Soviet mosaics in the world.

The best bagels in Berlin are tucked away in an independent bookstore.

In the summer of 1957, a massive architectural exhibition showed off the future of urban living in this German neighborhood.

This red light district plaza memorializes the Fab Four and their historic connection to the area.

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.

This stone figurine was made more than 6,000 years ago and depicts a female deity of the Neolithic Vinča culture.

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

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

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