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.

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

Sound travels strangely in this underground whispering gallery.

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

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

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

A miniature model of the iconic Stockholm department store.

The somber sculptures commemorating Irish Famine on the river Liffey in Dublin.

The design of this beautifully crafted building was inspired by Norwegian glaciers.

Started as a kitchen garden, now the second largest botanical garden in the world.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

An Irish church where an 800-year-old mummy is reaching out of his coffin as if to shake hands.

A mysterious plaque to the even more mysterious "Fr. Pat Noise," killed in "suspicious circumstances."

The modern birthplace of Irish freedom.

An 80-year-old plane tree is devouring an iron bench at Ireland's oldest law school.

This neon landmark has been posing this deadpan question to follicly-challenged Dubliners for over 50 years.

This permanent collection of preserved bodies taken from Irish bogs is one of the leading authorities on such morbid mummies.

A statue in the center of Dublin dedicated to one of their favorite sons of rock & roll.

The enchanting archway is the only surviving portal into Dublin’s lost medieval wall.

The mummified heart of a saint lives on in this church—after a brief hiatus when it was stolen.

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

A Gothic-inspired fish market is Gothenburg's best place to find loaves and fishes.

The charming storybook building now houses a small police museum.