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

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

Housing the famous Norwegian ice-defying 19th century polar exploration ship.

Across the Pacific in a raft, a museum dedicated to Thor Heyerdahl's now legendary expedition.

Home to three historic ships from the age of Vikings.

This handsomely carved wooden church is more than 800 years old.

One man's exploration of the human form, including the bizarre and delightful "Man Attacked by Babies."

A stunning architectural yet functional feat, towering over Oslo.

The former home of Norway's greatest romantic composer.

One of the most breathtaking railways in Europe also takes one of the steepest climbs, from fjord to mountain plateau.

Graffiti from the 16th and 17th centuries cover the walls of this part of the Tower of London.

These wire animal sculptures commemorate the exotic inhabitants that once called the Tower of London home.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

Engraved in stone here are the signatures of everyone who signed the Declaration of Independence.

These five houses were built for the 1933 Chicago World’s Fair.

This elegant structure at the heart of a Finger Lakes town was originally a drinking fountain.

A historic lighthouse steeped in rumors of ghost and pirate stories.

A near tragic event on this bridge helped inspire the classic film "It's a Wonderful Life."

Its original statue was deemed so ugly, locals called it “Scary Lucy.”

This fancifully decorated Victorian home in New York’s Hudson Valley is the only known fully domed octagonal residence in the United States.

A small Second Empire-style building is one of only seven remaining lighthouses on the Hudson River.

This Art Deco fortress in upstate New York gives Manhattan's vaunted examples of the style a run for their money.

The seat of Buffalo government is a gorgeous Art Deco palace.

Site of the first pathological and bacteriological research facility in the United States.