The vast, legendary catacombs hold secrets much stranger than stacked bones.

A heated statue pays tribute to one of Sweden's great actresses.

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

The Swedish flag over this small naval fort signals that the nation is at peace.

Sound travels strangely in this underground whispering gallery.

This giant subway sculpture celebrates the fruit that inspired the theory of gravity.

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

Every Tuesday, students let off steam by screaming into the night air.

A Japanese video game arcade hides in the back of a Swedish pool hall.

This giant crucifix is like U2's Joshua Tree for Swedish death metal fans.

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

Stockholm's narrowest alley is barely over two feet wide.

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

Stockholm's tiniest statue is of a small boy looking at the Moon.

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.

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

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

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

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

The world's largest model of our planetary system.

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

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