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

Tucked away in a downtown Stockholm park are the remains of a World War II defense position.

The suspected burial mound of legendary Viking Björn Ironside.

A former suicide bridge is now accumulating symbols of love instead of a body count.

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.

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

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.

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

Despite dreams of constructing this fairytale mansion, Albert Gotthard Nestor Cedergren never saw its completion.

This small statue hints at the incorrect origins of the lush landscape park surrounding it.

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.

The palace for King Gustav III was never completed, but the foundation remains tucked away in this city park.

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

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

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

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

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

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

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

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