Remnants of the 16th-century defensive wall still stand unassumingly within Edinburgh.

This early version of the guillotine was used to execute the man responsible for its construction.

The U.K.'s first underground railway line is now a lively thoroughfare for runners and cyclists.

The 16th-century church has the only stained glass windows that survived the Scottish Reformation intact.

The most loyal of little dogs, or a Victorian era publicity stunt?

Protecting the dead from opportunistic body snatchers.

Anonymously sculpted and donated, these sculptures made from poetry books and pages are sprinkled around the city.

This small museum in a 17th-century building honors three iconic Scottish writers.

A sweet symbol marks the place where torturous executions were once carried out.

The taxidermy remains of the first mammal ever cloned from an adult cell are on display in Edinburgh.

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

A heated statue pays tribute to one of Sweden's great actresses.

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.

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

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

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

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

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

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.

One of the most notorious leaders of the French Revolution once lived here.

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

There's something in the air as history repeats itself at this museum dedicated to the Swedish pop band.

Pay your respects to a country that only existed for a few weeks.