Berlin's old airport.

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

An engineering wonder at Pillnitz Castle protects a precious 230-year-old flowering shrub.

This museum housed in a former brothel explores the past and present of sex work in Amsterdam.

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

Cat art as far as the eye can see.

A floating cat sanctuary on an Amsterdam canal.

This bird-loving brewery is situated in an old municipal bathhouse, nestled beside a 300-year-old windmill.

A unique collection of gilded age mechanical pianos.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

A collection of biblical memorabilia.

A rare tour of an aristocrat's private home reveals valuable 17th-century paintings from artists like Rembrandt.

Sail in for a ’dam good slice.

This subterranean studio is filled with fascinating kinetic art.