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

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

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

When this 18th-century observatory's meridian was moved, it set Sweden's time back by 0.04 seconds.

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

Once the world's most modern observatory, this building is now a private school.

This statue and park honor the Swedish chemist Jacob Berzelius, one of the founders of modern chemistry.

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

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.

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

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

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.

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

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

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

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

An old Danish political institution where members of government can grab a drink off the record.

Site of the first radio and telephone broadcasting companies in Copenhagen.

This sculptural representation of an Andersen fairy tale had to be pushed away for being too grim.

Once a meeting point for great thinkers, and the midpoint of the country.

The house where a Danish physicist discovered the connection between electricity and magnetism.

Denmark’s oldest bakery is home to the 'Wednesday Snail,' one of the best cinnamon rolls on the planet.

The only surviving piece of Copenhagen's 16th-century defensive wall.