This giant subway sculpture celebrates the fruit that inspired the theory of gravity.

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.

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

This railroad track was so secretive that it was omitted from all maps.

A former suicide bridge is now accumulating symbols of love instead of a body count.

If there is one thing you don't want to be in Sweden during Christmas, it's a Yule Goat.

This grisly exhibit houses skeletons and weapons from a devastating 14th-century clash.

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

It was meant to help transport wounded soldiers to a secret underground hospital.

The Guardian of Tallinn.

Locals rallied to save this beloved mural after someone mistakenly attempted to cover it.

The official meeting point for the oddly named governing assembly of ancient Sweden.

The largest Chinese cemetery in the world outside of China dates back to the 15th century.

Malaysia's first and only glass temple.

A lush indoor jungle fills this bustling Madrid transportation hub.

A mysterious, hidden cluster of Buddha sculptures carved into the rocks.

Sacred Buddhist home of some spiritual monkeys.

Singapore's landscaping project is home to 18 incredible Supertrees.

A battle between nature and architecture in the Cambodian jungle.

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

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

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

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

A plaque marks the house in Stockholm where the French philosopher René Descartes lived up until his death.