A competition inspired by Stephen King's psychological horror novel "The Long Walk."

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

The three colorful women depict characters from a beloved children's story.

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

This unique sculpture is often overlooked by pedestrians.

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

The apartment where Pippi Longstocking came to life.

A Stockholm metro station is home to an escalator that is not only the longest in Sweden, but among the longest in the world.

An ancient tree that was once the favorite of a young Swedish royal.

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

Hidden in plain sight, Sweden's official ordnance datum is now abandoned.

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

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

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

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

Although rarely used, there is still a hidden room for the royal family at the Stockholm central station.

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

"Only the dead get off at Kymlinge."

No one knows who's responsible for decorating this tunnel with stuffed animals, but the people love it enough to protest their removal.

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

Street artists transformed this abandoned industrial neighborhood into one of Europe's largest graffiti exhibitions.

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

Now a hotel, this former bank was the site of a robbery that spawned a psychological phenomenon.

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