For more than 170 years, this family-run bakery has been serving Berlin’s best Baumkuchen, or “tree cake.”

A university observatory dome painted to resemble the beloved 'Star Wars' droid.

This water-tower-turned-high-end-apartment building was once the site of an early Nazi concentration camp.

Explore the complex ecology of this multifaceted nature preserve by riverboat.

An early 19th-century English style garden hidden in the Rotterdam cityscape.

A huge Megalithic chamber tomb located behind a cafe.

A giant bug impaled on a 75-foot-tall needle.

This sprawling Belgian fort was once thought of as impenetrable but now it is simply an abandoned relic.

Brussels' favorite peeing boy has a sister.

A Museum of Psychiatry in a still-operating mental institution.

One of the deepest indoor swimming pools in the world.

A Belgian self-built tower inspired by the Bible and ancient civilizations.

This collection of over 50 murals celebrates Brussels' rich history as the self-proclaimed home of the "comic strip."

A little known pile of scraps and plaques mark the grave of a downed RAF bomber.

Since 1920, one small company has defined the distinctive chairs of Paris' sidewalk bistros.

An interactive museum and restaurant devoted to a prestigious breed of cattle.

Visit a museum dedicated to the “the king of cheeses.”

The ruins of a medieval castle linked to the murderous French lord that inspired the famous legend of Bluebeard.

The opulent home that inspired Tintin's Marlinspike Hall and the adventures within.

Nicknamed the "Museum of Horrors," this French anatomical collection has been fascinating visitors for over a century.

135 bronze medallions mark a French meridian line which once rivaled the hotshot Greenwich timeline.

The industrial architecture honors the laborers who brought the Exposition Universelle of 1900 to life.

At Monet's beloved home you can still see the Japanese bridge, waterlilies, and weeping willows that were the subjects of some of his most iconic paintings.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.