This grubby wall is said to be one of the Earth's esoteric energy centers.

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

This biographical museum honors the groundbreaking scientist at her birthplace in Warsaw.

Eighty million natural history specimens call this gargantuan museum home.

Catacombs turned marketplace.

Hear the quietest sound from across the dome.

An early 20th-century bullring converted into a modern shopping center.

Open air sculptures by an eccentric and loin-clothed hermit.

This postmodern apartment block was designed to be a vertical neighborhood.

Originally used to sell brandy, the bull-shaped billboard became an iconic symbol of Spain.

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

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

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

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

A statue honors the children who fought Nazis in Poland.

A striking public sculpture representing the period of martial law in Communist Poland.

The silly symbol for an underground protest group is now scattered around the city.

The world's most elegant power lines.

This gem from the industrial age helps visitors and residents alike traverse hilly Stockholm.

Living towers made of people that are now recognized by UNESCO.

Old ships and machinery fill a historic harbor in the city that's home to Europe's largest port.

This sprawling concrete suburb of Kraków was designed by the Soviet Union as the model proletarian city.

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

Poland's oldest surviving university building holds a wealth of historic science instruments including some used by Copernicus.