A lush indoor jungle fills this bustling Madrid transportation hub.

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

Dublin's most modern, visually spectacular bridge is modeled after Ireland's national emblem.

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

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

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

Travelers who fall victim to this mermaid's charms are destined to stay in Užupis forever.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

This macabre masterpiece of a mural is one of Francisco Goya's "Black Paintings."

This poignant sculpture of a gnarled weapon is a symbol of non-violence.

This triumphal arch celebrating the Sun King's conquest of Lille is a masterpiece of military architecture.

This lucky bronze frog was gifted to Madrid by a casino.

The western face was supposedly left clock-less to snub the Welsh.

Stockholm's deepest subway station is also a stunning ecological wonder.

Iceland's tribute to its thankless civil servants.

In Northeastern Iceland lies something of an oxymoron: a steaming desert.

What happens when you cross a mayor and a painter?

This ominous Albanian fortress houses tanks and downed planes as a reminder of their victories over Western imperialism.

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

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

A medieval bridge stretches over a sulfur-rich river that leads to year-round natural hot springs.

A naturally beautiful, seemingly bottomless deep blue spring.

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