Frequent fliers welcome in this airplane hotel.

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.

Stockholm's deepest subway station is also a stunning ecological wonder.

Now a hotel, this former bank was the site of a robbery that spawned a psychological phenomenon.

The internet as provided by a James Bond villain.

This Stockholm light tower can be controlled by anyone with a smartphone.

Sweden's first nuclear reactor, R1, can be visited 25 meters underground.

It houses the remains of a 17th-century version of the Titanic.

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

This subterranean studio is filled with fascinating kinetic art.

This unusual elevator doesn’t stop or slow down.

Seven mini rowhouses fill the gap between 54 and 70 Westerstraat.

A beautifully eclectic mix of architectural styles.

The history and future of cannabis.

This historic Amsterdam bar used to accept sailor's monkeys as payment.

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

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

The world's first zoo for microbes collecting the horrible and wonderful things living on and around us.

Wind power station for making famous Ketel One vodka.

A strangely curved lamppost stands tall over this avenue in Rotterdam.

Old ships and machinery fill a historic harbor in the city that's home to Europe's largest port.

The compass on its front was a handy tool for 17th-century merchants who needed to know the direction of the wind.

The bronzed skull of a beheaded traitor was affixed to the city gate in the 17th century.

Explore 400,000 years of humans' "battle against darkness" in this offbeat but thorough lamp museum.