A prehistoric geological oddity tucked behind Stockholm's natural history museum.

A plaque is all that remains of a lost Oxford transport hub.

The train engine is tucked under an apartment building on a quiet Tokyo street.

Water-themed sculptures guard this unusually square structure.

This century-old street sign is a forgotten remnant of the old city.

The second-largest collection of runic calendar staffs in Sweden.

An ancient Viking runestone hidden in plain view in Stockholm's old town.

A scale model of the world's largest existing lensed telescope.

This statue and park honor the Swedish chemist Jacob Berzelius, one of the founders of modern chemistry.

When a conglomerate of visionary startups commandeer a disused Greek Orthodox Church, zaniness ensues.

A hidden bathhouse in one of Stockholm's oldest and busiest neighborhoods is open to anyone who can find it.

The three colorful women depict characters from a beloved children's story.

It was meant to help transport wounded soldiers to a secret underground hospital.

A steel paper plane is all that remains of a crashed aircraft that caused an amazingly small amount of damage.

"Only the dead get off at Kymlinge."

It's always game time at Stockholm's only museum devoted solely to video games.

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.

A man has revenged his true love's betrayal through tears and stone genitalia.

The remains of Alfred Nobel's first nitroglycerine factory can still be found on the shores of a Swedish bay.

This homeless brass fox tugs at your heartstrings from the foot of a Stockholm bridge.

This futuristically sylvan church is a glass-enclosed marvel of modern architecture.

This ornate English estates "Prodigy House" still bears the cannonball marks of civil war.

This landmark Victorian folly rewards visitors with spectacular views over the Peak District.

Unknown to many, this is where items not displayed in a Dutch history of science museum are held.