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

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

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

A man has revenged his true love's betrayal through tears and stone genitalia.

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

Sweden's first nuclear reactor, R1, can be visited 25 meters underground.

A display of magnificent stained glass windows is the first exhibit of its kind.

The last masonry skyscraper ever built reveals a transitional moment in architectural history.

A spectacular remnant of an Adler and Sullivan masterpiece that was destroyed in 1972.

Chicago's Navy Pier on Lake Michigan was a training hub for aircraft carrier pilots during WWII.

A 400-foot-tall tall map of Chicago makes this once-ignored building stand out.

One of the few remaining relics of the meatpacking hub that made Chicago the "hog butcher to the world."

You can take a class, browse the library, or visit the lavish lair of an international men's humor society.

Former bath house turns gastropub.

This surprising gem is a world-class archeological museum hidden at the University of Chicago.

A science teacher's dream.

Recognized the world over as the home of the McCallisters in the 1990 movie "Home Alone."

Sweden's oldest animated sign is still lighting up the skyline today.

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

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

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

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

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

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