This extensive collection covers thousands of years of Polish military history.

Special benches that play Chopin's music are scattered throughout his native city.

An artificial date palm stands as a memorial to Warsaw's Jewish community.

This bell stars in a tragic love tale and is said to make wishes come true.

The giant statue and its model solar system honor the native Pole who declared that the Earth revolves around the Sun.

The Polish capital has had a deep connection to its guardian mermaid for almost a millennium now.

A statue honors the children who fought Nazis in Poland.

A menacing statue of this mythical creature can be seen at the legendary site of the monster's lair.

A tribute to the Polish insurgents who fought in the failed attempt to end their city's Nazi occupation.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

The complex has been abandoned since the Croatian War of Independence, barring a stint as a set for 'Game of Thrones.'

The oldest standing Byzantine church in Athens is tucked within a monastery in the middle of an upscale shopping district.

The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.

This striking sculpture of Icarus honors Greece's fallen flyers.

Where commuters walk through remnants of an ancient Greek necropolis.

An ancient octagonal weather station named for the eight Greek gods of wind.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

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

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.

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

Hundreds of thousands of concrete bunkers crowd Albania long after the fall of Communism.