Small Easter eggs are hidden in the ventilation holes of the city's newest trains.

An abstract representation of weather in Sweden.

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

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

Several cannonballs of mysterious origins decorate two buildings in Stortoget's main square.

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

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.

This centuries-old rooster survived a devastating fire.

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

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

A wooden street sign is the last remnant of this 400-year-old alleyway.

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

One of the world's first dedicated bank buildings in the world is now the oldest one.

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

Sweden's oldest animated sign is still lighting up the skyline today.

This unique sculpture is often overlooked by pedestrians.

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

Not quite the cultural gateway between China and Sweden its designer imagined.

A Viking man's tribute to his brother stands in Gävle's oldest church.

If there is one thing you don't want to be in Sweden during Christmas, it's a Yule Goat.

A heated sculpture pays tribute to an actor who loved hugs.

Contrasting the old concrete courthouse beneath, a modern and colorful residential marvel has emerged, stirring both acclaim and controversy.

World's strongest whirlpool.

The convergence of two currents makes this a surprisingly pleasant getaway in the Arctic Circle.