An abstract representation of weather in Sweden.

The center of Stockholm can be found along this quiet street.

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

A temporary art piece to celebrate LGBTQ Pride is now a permanent part of Stockholm's traffic landscape.

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

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

Enormous ants wielding giant pine needles guard a Stockholm real estate company's office.

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

Sound travels strangely in this underground whispering gallery.

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

Stockholm's tiniest statue is of a small boy looking at the Moon.

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.

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.

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

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

This Stockholm light tower can be controlled by anyone with a smartphone.

The library's graceful rotunda is like a bibliophile's temple.

A hidden bathhouse in one of Stockholm's oldest and busiest neighborhoods is open to anyone who can find it.

Sweden's first nuclear reactor, R1, can be visited 25 meters underground.

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