The old observatory in Copenhagen has a spiral corridor used as a racetrack.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

Copenhagen's celebrated theme park and gardens.

This supermarket is suspended 25 feet above an interstate highway.

This bridge was the birthplace of a unit of measurement based on a fraternity joke.

An interesting decoration on this historic site, this weathervane comes with as many legends as it does questions.

One of the indelible moments of the American Revolution took place at this location.

Historic Hull Street was actually the first street with a proper name in the Boston area.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

An easy-to-miss garden in Boston's North End honors the mother of JFK and others who lost children in WWII.

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

From bench to vandalism to art, this silly prank seat was funny enough to become permanent.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

The Boston square dedicated to the dark poet who was born nearby.

An enormous, inside-out glass globe built in 1935.

One of many reminders of Tesla's scientific contributions overlooks the falls which inspired him.

In upstate New York, gorgeous waterfalls and a watermill are slowly being reclaimed by nature.

Within this beautiful Pittsburgh cemetery, a unique headstone bears witness to one man's eternal love for Jaws.

This elaborate towering structure was once famed for its revolutionary height.

Yo, Adrian!

The only way to see Pittsburgh is from the top of this lookout point, just like the ancient members of the native peoples did.

There aren't too many operational funiculars around, but Pittsburgh has two!