A set of seven houses, each built in a style that represents a European country.

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

This massive mural by famed pop-artist Keith Haring was hidden for almost 30 years until its 2018 rediscovery.

An overgrown and largely forgotten cemetery lies hidden within the outskirts of Amsterdam.

Sail in for a ’dam good slice.

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

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

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

This 22-floor tower's Skydeck offers panoramic views of Amsterdam.

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

An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

This colorful and quirky set of pegasus sculptures celebrate the works of poet Zbigniew Herbert.

A delightful museum entirely dedicated to the tiny homes of dolls.

This hidden collection of everyday objects illustrates life within communist Poland.

A hidden art gallery in an abandoned Warsaw fort.

A program of Communist glamour in post-Stalin Poland is preserved in this colorful museum.

Frequent fliers welcome in this airplane hotel.

The single richest source of elemental discoveries in the world.

No one knows who's responsible for decorating this tunnel with stuffed animals, but the people love it enough to protest their removal.

A Japanese video game arcade hides in the back of a Swedish pool hall.

Stockholm's narrowest alley is barely over two feet wide.

The discovery of an old wall led to the creation of this fascinating museum about the city in the Middle Ages.

The internet as provided by a James Bond villain.

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.