A playground inspired by differential calculus dangles from the ceiling of the Liberty Science Center.

Vacant Beaux-Arts buildings that serve as reminders of a beach town’s glory days.

Rusting away on the edge of New Jersey are the remains of a Cold War missile launch site.

The rusting remains are visible sticking out of the waters of the Delaware Bay.

The boulder on which Alexander Hamilton laid his head after a deadly duel can still be visited on the New Jersey coast.

Step inside Lucy, the world's largest "elephant."

Step into Monet's world at this fine-dining restaurant in the middle of a New Jersey sculpture park.

This old residential building was once the largest flour mill in the world.

One of the world's premier laboratories for hydraulic engineering research takes full advantage of the water's power.

1887 era Russian Orthodox church in Minneapolis.

One of two giant blue cockerel statues erected with an intentional double meaning.

The oldest continually used church in Minneapolis also sells great meat pies.

The only arched bridge made of stone on the entire Mississippi River.

When flour explodes, it's not a pretty sight.

A toweringly silly piece of modern art has been delighting locals since the 1980s.

20,000 pieces in a Frank Gehry-designed building.

Controversial tribute to the heavyweight champion boxer who grew up in Detroit.

38-story baroque tower reflecting Detroit's rise, fall, and possible rise again.

Detroit’s downtown castle is one of the oldest structures in the city.

The world’s largest Masonic temple was saved by the White Stripes.

These enduring murals depicting a distinctly Marxist tribute to capitalism could not even be defeated by McCarthyism.

Millions of numbers carved in glass represent the tattoos forced upon victims.

Dedicated to one of the darkest moments in Irish history.

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