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

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

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.

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

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.

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

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

This centuries-old rooster survived a devastating fire.

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

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

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

Absolutely no saxophones in the library.

This large open-air museum showcases the ordinary lives of the people of the Netherlands and pre-industrial crafts and practices.

Not many houses move across borders, this one did it twice.

A maze of crosses marks the jumbled divide between the Netherlands and Belgium.

A tribute to smugglers and the Butter Wars.

Underground attraction offering tours of the foundational ruins of a church nave that collapsed in 1674.

Yup, that's a 330-foot yacht passing over the highway.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.

A sulfuric martian landscape that looks far better than it smells.