Tucked in the back of a flower shop, its collection details the fascinating history of the Netherlands's iconic symbol.

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

This impressive collection of rare books on ancient mysticism inspired author Dan Brown.

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

This dockworkers' lunch joint has been left leaning by a century of storm floods.

This wooden hotel is a temple to German sustainability and forest conservation.

A church filled with the bones of hundreds of virgins martyrs—or so they say.

An elegant chandelier hangs over this ancient sewer chamber, now open for concerts and public tours.

Behold, a collection dedicated to Germany's favorite vegetable.

The oldest trees in Northern Germany.

The birthplace of Karl Marx is now a museum dedicated to the communist revolutionary's life and work.

The entrance to this Frankfurt subway station looks like an old tram car crashed into the concrete sidewalk.

This riverside restaurant has been serving customers since 1146.

A collection of artworks exclusively created by the mentally ill that was almost burned by Nazi culture police.

Tiny memorials honor individual victims of the Holocaust.

Bursting forth from a historic German neighborhood, these day-glo palaces are now a bright fixture in the town.

This German museum is devoted to all aspects of grave culture from headstones to coffins.

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

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.