This once-forgotten oasis in the middle of Lisbon was first created over a century ago quite by accident.

This little-known national museum houses over 40,000 works of art from across the world.

Little-known artist couple chose a former silk factory as the location for a museum dedicated to their work and other avant-garde art.

The world's oldest Jewish library was founded by Sephardic Jews in 17th century Amsterdam.

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

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

A hidden church in a hidden courtyard tells the story of the Miracle of Amsterdam.

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

These lights mark the area of Rotterdam that was bombed and burned in 1940.

Inside this metro station is a section of the city's former medieval fortification.

A true Valhalla for cactus and succulent lovers.

This colorfully-painted tunnel links two distinct parts of a historic neighborhood.

A condensed piece of China floating in a Dutch harbor.

A bridge that has seen many reiterations over its lifetime.

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

A tiny house showcases the busy life of a local gnome.

The remains of a medieval wall discovered in the basement of a jewelry store.

A relic of the old jail still stands in its original location.

An ancient Egyptian temple sits within a modern European museum.

Hidden within a Netherlands crater is a stone bed that lets those who lie in it see the sky as a curved surface.

A seven-century-old jail tells a not-so-pleasant history of crime and punishment.

Now a museum, this building was once a 14th-century monastery and the place where the founder of the Dutch nation lived and was assassinated.

Outdoor art exhibition made of classic Tetris pieces.

One of Australia's largest secondhand bookstores.