This prehistoric sinkhole lured exclusively male mammoths to their death, much to the delight of science.

A three-piece musical sculpture installed between the subway tracks at Kendall Station near MIT.

This impressive working clock made of 16,000 plants changes its flowers twice a year.

The place where the great marine explorer first learned to work underwater is not where you'd expect.

The United States’s oldest funicular railway glides up and down a steep Pittsburgh street.

This Swedish astronomical clock was in storage for almost a century before its glorious workings were put on display once more.

Swedish skyscraper with a 90° twist.

This chimerical bridge/tunnel appears to dead end right into the sea.

That bass was as bad a fish as any angler ever knew.

This sprawling 18th-century cemetery features unique and beautiful gravestones, including one shaped like a tree.

Fans of vintage Vegas, kitsch, and toy pony-based gambling now flock to a casino called The D.

When the town wouldn't allow the fast-food behemoth to build a new restaurant, they put one inside an 1850 home.

Once the site of a Native American harvest festival, this humble clearing later played an invaluable role in the birth of jazz.

This distinctive Crescent City tradition dates back to the days of horse-drawn carriages.

A whale of a public art display towers atop Juneau's cruise ship dock.

The world's largest outdoor organ is played weekly by one of just two civic organists in the U.S.

The world-record holder for the longest bridge stretching continuously over water.

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

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

Outside a Viking museum sits a modern-day runestone made by a Swedish runemaster using traditional methods.

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

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

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

Every Tuesday, students let off steam by screaming into the night air.