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

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

An outdoor urban gallery of large-scale artworks by the world's most influential street artists.

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

A lush green oasis in the middle of Chicago.

Beautiful scenery, history, science, and physics come together in this remnant of shipping lore.

This 29-ton granite ball spins around at the slightest touch thanks to a scientific phenomenon.

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

The United States’s oldest funicular railway glides up and down a steep Pittsburgh street.

Color-coded signs direct drivers on a network of routes designed to avoid Pittsburgh traffic.

A wacky two-story folk-art assemblage of carved and found objects, with lights, motion, and sound now in need of financial support.

A natural spring situated on the grounds of the Hawthorne estate.

One of the last active volcanoes on the Eastern seaboard.

An enormous warehouse filled with parade floats collected from over 50 years of patriotic celebrations.

The fifth-longest suspension bridge the world, connecting one Michigan peninsula to another.

This shallow cave got its name from copious amount of human bones found inside.

Island where motor vehicles are banned -- home to the only carless highway in the United States.

This engineering marvel is the longest bridge in Canada and one of the longest spans in the world.

Remnants of the most densely packed city in world history, that thrived on anarchy for 30 years.

A tradition unlike any other, this marks the site of the annual Groundhog's Day tradition.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

A former mental hospital founded in the 1930s by a eugenicist who advocated for the forced sterilization of patients.

Forget Hollywood, one of the biggest stars in the world can be found in Roanoke, Virginia.

America's post-nuclear-attack chambers of Congress.