When this 18th-century observatory's meridian was moved, it set Sweden's time back by 0.04 seconds.

Stockholm's tiniest statue is of a small boy looking at the Moon.

The world's largest model of our planetary system.

This Stockholm light tower can be controlled by anyone with a smartphone.

The library's graceful rotunda is like a bibliophile's temple.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

Go surfing on this urban wave, "hacked" by local surfers.

Golden cobblestones remember a time when this small alley was used to avoid having to give a Nazi salute.

The footprint of a frustrated devil in Munich's Cathedral.

These bronze pamphlets remember a remarkable group of Germans who fearlessly opposed the Nazis in the very center of their power.

Current docking place of the SS United States, the fastest transatlantic ocean liner.

A daily replay of the experiment that proved the rotation of the Earth.

This elaborate towering structure was once famed for its revolutionary height.

Yo, Adrian!

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

A layered tribute to the work of mosaicist Isaiah Zagar.

World's first "penitentiary," meant to be humane, drove men insane.

This monument marks the beginning journey of a wounded soldier's leg that ended up almost two states away.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

Petting this mysterious iron monkey supposedly brings good luck.

A public urinal so pretty, it was declared a national monument.

This pirate-broadcasting-tower-turned-restaurant played a rebellious role in the history of Dutch television.

Three connected pink triangles memorialize persecuted gays and lesbians throughout history.

This cheese shop also houses a museum devoted to Dutch dairy.