This Dresden church was purposely rebuilt Protestant after being demolished in World War II.

Giant topiary dog once played a role in a terrorist bomb plot.

A series of waterfalls so massive they straddle the border of Argentina and Brazil.

The university library shaped like a giant piece of Swiss cheese.

Artworks by loners, prisoners and the criminally insane.

A hollow cement depiction of time's inexorable effect on the human body.

What's left of the ruins of the 1893 Columbian Exhibition, or World's Fair, also known as the White City.

A science teacher's dream.

This bronze sculpture on a former squash court marks the secret origins of the Atomic Age.

A monument to the art of slicing people open.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

The longest escalator in the Western Hemisphere takes over three minutes to ride down.

The U.S. government built the million-pound stack of steel during the Space Race.

This golfball sized platinum iridium cylinder is the official starting point for all national weight calibrations

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

An amazing collection of sculptures and art.

The last of a gourmet supermarket chain, this store helped spark California's Food Revolution.

Pillars made of 700 pieces of luggage climb to the ceiling of Sacramento Airport's baggage claim.

The California capital city once stood 10 feet lower than it does today.

I Street Bridge is the heaviest swinging center bridge in the United States.

The last living thing to come out of the rubble after 9/11 is now a symbol of hope and resilience.

The crown jewel of the Queens Museum is a nearly 10,000-square-foot architectural model of the city originally built for the 1964 World's Fair.

A Pythagorean funhouse that tries, successfully, to prove that math is the coolest thing ever.

An Irish Memorial commemorating those who perished due to potato blight.