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

A concrete Picasso in the middle of a student housing complex on the outskirts of Stockholm.

A 12th-century church with a medieval fresco and an intriguing “Greek runestone.”

An 11th-century runestone decorates the halls of Terminal 2 of this Scandinavian travel hub.

A king's bloodstained shirt is among the gruesome collection of artifacts displayed below Stockholm's Royal Palace.

Outside a Viking museum sits a modern-day runestone made by a Swedish runemaster using traditional methods.

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

This grisly exhibit houses skeletons and weapons from a devastating 14th-century clash.

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

Street artists transformed this abandoned industrial neighborhood into one of Europe's largest graffiti exhibitions.

A rare surviving Victorian greenhouse designed specifically to house giant water lilies.

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

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

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

Sweden's "good old days" painstakingly re-created in a model village.

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

The world's largest model of our planetary system.

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

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.

Swedish mice can dine at the Nuts of Life restaurant or take a date to the amousement park.

This quarry filled with 65 million-year-old limestone is now home to a nature reserve.

This poignant sculpture of a gnarled weapon is a symbol of non-violence.

This chimerical bridge/tunnel appears to dead end right into the sea.