Outside a Viking museum sits a modern-day runestone made by a Swedish runemaster using traditional methods.

What looks like a birch tree smushed between two pieces of glass often confounds commuters.

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

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

A golden plaque marks the site of the mysterious unsolved assassination of the former Swedish prime minister.

This pair of unsuspecting buildings are in fact the very first modern skyscrapers in Europe.

It houses the remains of a 17th-century version of the Titanic.

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

The scars of a remarkably organized public protest to save 13 elm trees are still visible in this Stockholm park.

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

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

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

A wooden street sign is the last remnant of this 400-year-old alleyway.

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

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

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.

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

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

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

Bored potato-guarding Nazis etched their thoughts onto a brick storage building in Copenhagen's Meatpacking District.

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

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

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

Six beautiful wooden giants are hidden around Copenhagen.