Legend holds that this knife serves as a chilling reminder of the deadly rivalry between two local builder brothers.

Remnants from a time before electricity.

Beneath Kraków Old Town's main square lies a hologram-filled medieval market vampire graveyard wonderland.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

An abstract representation of weather in Sweden.

What looks like a birch tree smushed between two pieces of glass often confounds commuters.

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

This pair of unsuspecting buildings are in fact the very first modern skyscrapers in Europe.

A concrete mushroom that divided Stockholm residents for nearly a century.

A statue that stood at the center of a long copyright battle.

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

A collection of trees from various corners of the world call Stockholm University home.

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

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

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

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

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.

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.

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.

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

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