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

Elevated freight railway turned wildly successful urban park.

Tucked in the back of this amazing antique store is an important piece of medical history.

A terrific purveyor of natural history objects and curios.

These strange large stones served as a campsite and lookout post for generations of Native Americans.

This graceful little figure is a one-of-a-kind version of the cherished character.

This whimsical Oz-themed park had a wonderful impact on the surrounding neighborhood.

A display of magnificent stained glass windows is the first exhibit of its kind.

Not to be confused with the iconic New York City skyscraper, this Chicago building is a vibrant hub for artists.

This shop for all your super spy needs hides an educational secret.

Internationally known record store and purveyor of "dusties."

Once called the "Polish Gold Coast" it is an icon of the neighborhood that bears its same name.

A hot dog stand where the heads are just as hot as the dogs.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

The mummified heart of Louis XVII, the lost dauphin of the French Revolution.

This ancient Roman bridge and aqueduct still stands as a wonder of classical construction.

A natural arch carved by a river gave its name to the so-called "Cave of Forgotten Dreams."

Natural history museum celebrating biodiversity with a parade of taxidermy animals.

The celebrated eyesore created by starry-eyed sweethearts.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

A memorial to the nearly 10,000 American soldiers laid to rest on the beaches of Normandy during WWII.

Knoxville’s architectural icon was the symbol of the 1982 World’s Fair, even catching the googly eye of Bart Simpson.

What happens here stays here – unless it affects the whole world.

The oldest experimental corn field in America is still creating better ways to grow crops.