Sound travels strangely in this underground whispering gallery.

This giant subway sculpture celebrates the fruit that inspired the theory of gravity.

Not far from the busy city lie these remains of a time when the world was on fire.

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

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

Celebrating the Swedish ship used in the first Arctic expedition to navigate through the Northeast Passage.

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

A response to the wrongly placed meridian of the same name.

A concrete Picasso in the middle of a student housing complex on the outskirts of Stockholm.

Crystal chandeliers brighten up this dark underpass.

This stone obelisk is a relic of the 17th-century Swedish mile markers.

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

There are hidden patterns on the subway seats of some Stockholm metro cars.

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

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

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

A steel paper plane is all that remains of a crashed aircraft that caused an amazingly small amount of damage.

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

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

A miniature statue of a beloved character from children's literature.

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

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

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.