One of the world's oldest continuously operating meteorological stations sits on a hill in Stockholm.

"Only the dead get off at Kymlinge."

A traveling Bronze Age sacrificial stone that was used to honor elves, fairies, and other woodland spirits.

This railroad track was so secretive that it was omitted from all maps.

It was meant to help transport wounded soldiers to a secret underground hospital.

This small museum nestled inside a souvenir shop is dedicated to Sweden's most well-known toy.

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

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

The composer known as the "Swedish Mozart" arranged to be buried in an unusual spot.

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

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

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

This tree was once used to calculate the decrease of the Baltic Sea.

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

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

A 130-year-old urinal is the oldest of Stockholm and perhaps all of Sweden.

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

Crystal chandeliers brighten up this dark underpass.

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

Inside this church, a monument honors the first burial site of the famed philosopher.

Part of an abandoned19th-century fortress hides in plain sight inside a modern office building.

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

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

Finally reunited, the three effigies now stand in a museum courtyard.