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

The library's graceful rotunda is like a bibliophile's temple.

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

Dine on food tied to Viking history and legend at this subterranean Stockholm spot.

Stockholm's last remaining paternoster elevator.

This gem from the industrial age helps visitors and residents alike traverse hilly Stockholm.

A plaque marks the house in Stockholm where the French philosopher René Descartes lived up until his death.

Eat a Nobel banquet from any year in the basement of Stockholm's City Hall.

The single richest source of elemental discoveries in the world.

"Only the dead get off at Kymlinge."

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

Water of undetermined depth has attracted rare fish and cult leaders alike.

Two large eyes painted anonymously on a mountain overlooking the city pay homage to an old legend.

Spend your honeymoon where the Devil had his wedding.

A decommissioned submarine base makes a great space for graffiti art.

Estonia's largest creative city is a vibrant bohemian hub located within a former industrial complex.

Disused seaplane hangar gets a second life as the jaw-dropping home of Estonia's museum of maritime history.

The ruins of an Estonian prison are drowning in the quarry lake where the convicts were once forced to work.

"There's nothing there," and other lies the KGB told us.

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

An illuminated manuscript comprising the life's work of a lone monk, inexplicably decorated with a portrait of Satan himself.

This building featuring Brutalist architecture has a rich media production history.

These 5,000-year-old cave paintings provide a glimpse into prehistoric Finnish life.

Fortifications built for a Soviet invasion that never came now sit abandoned in a losing battle against nature.