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

A steel paper plane is all that remains of a crashed aircraft that caused an amazingly small amount of damage.

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

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

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.

Frequent fliers welcome in this airplane hotel.

The discovery of an old wall led to the creation of this fascinating museum about the city in the Middle Ages.

Sweden's "good old days" painstakingly re-created in a model village.

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

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

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

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.

Home to thousands of dolls from around the world, including the "blue-eyed dolls" that came to Japan as American ambassadors.

At the time of its construction, this type of door was nearly unheard of.

The decommissioned steam engine’s whistle can still be heard three times a day at one of Japan’s oldest train stations.

This park boasts a unusual collection of curious monuments from around the world, from Micronesia to Antarctica.

Remnants of an old bank adorn this station's brick wall.

Home to herbal cosmetics, teas, and a unique set of dolls known as kitchen witches.

See no evil, hear no evil, speak no evil.

The last remaining pre-dreadnought battleship in the world has been a museum for nearly a century.

Once the main gateway to Tokyo, sneaking through this checkpoint was a capital offense in feudal times.

Passengers are not allowed to set foot outside this station, but you can still enjoy spectacular views of the sea from the platform.