The single richest source of elemental discoveries in the world.

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.

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.

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

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

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

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

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

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

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

A Gothic-inspired fish market is Gothenburg's best place to find loaves and fishes.

This castle ruin in the middle of nowhere is a gem for wildlife enthusiasts.

One of the world's few mounted blue whales, its jaws are hinged open allowing visitors to descend into a lounge.

Once the center of power for the region's various factories.

This Swedish astronomical clock was in storage for almost a century before its glorious workings were put on display once more.

These ancient rune stones plucked from the countryside now call this university park home.

At this bohemian accommodation, guests who dream of joining the circus can spend the night in themed wagons.

A natural wonder in south Denmark.

From buck blood to Theriak miracle tonic, this collection of Renaissance chemist's gear look's like a wizard's pantry.

An old limestone mine transformed into a beautiful and unusual sculpture museum.

A walkable map of the world, made from soil and stone by one man.

The decaying remains of a 1960s mechanical wonderland that never officially closed.