A brush maker used his factory to protect blind Jews from the Gestapo.

This little museum is making sure that the art and history of the graffiti sticker is not scraped from history.

Berlin's natural history museum houses the world's largest mounted dinosaur and the late beloved polar bear Knut.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

Berliners converted a bombed-out, disused lot into a community-run urban farm with its own cafe and bar.

Residents of Berlin take their coffee and cake in one of the city’s most restful spaces: a cemetery.

A significant example of Czech cubist architecture—a style you won't find anywhere else in the world.

Local folklore claims that this wall was not built for defense, but to provide labor during a time of famine.

The palace window through which Protestant nobles flung two Catholic regents, thus sparking the Thirty Years' War.

This large copper bolt represents the benchmark for measuring sea levels in most of Europe.

The attic of a four-century-old canal house hides a clandestine church.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

Established in 1638 to battle the Black Death, Hortus Botanicus Amsterdam is a treasure trove of rare flora.

A floating cat sanctuary on an Amsterdam canal.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

The world's only museum devoted to the wonders of fluorescence.

A historic recreation of the golden age of the Erie Canal, abandoned for some time, slowly being restored.

A miniature village mimics the surrounding buildings so well it includes itself.

The only natural lake in the world that drains into both the Atlantic and Pacific Oceans.

This mining town boomed in the Atomic Age when uranium was gold, only to be abandoned when the industry collapsed.