One lonely, modern pyramid has gone from corporate think tank to deserted boondoggle.

The Bong-area park police have asked visitors to please, stop stealing the signs.

In a quiet north Chicago neighborhood rests a stunning relic of the golden age of earthenware design.

Designed by Alfred Caldwel, this landscape showcases his vision of a native garden.

Chicago's Navy Pier on Lake Michigan was a training hub for aircraft carrier pilots during WWII.

Over 1,000 pieces of one of the most niche art objects imaginable: the glass paperweight.

The last masonry skyscraper ever built reveals a transitional moment in architectural history.

A theater sits abandoned on Roosevelt Road, once majestic in splendor, now majestic in decay.

This solitary gravestone is separated from the rest in Appleton, explaining why local legends continue to surround it.

A statue honors the genius who allegedly first took a meatball and made it into a hamburger.

This architectural stunner is one of the few surviving Egyptian Revival theaters in the U.S.

The oldest university museum west of the Mississippi retains its 19th century feel.

One of the first commercially successful anthracite-powered iron-making operations in North America.

A smaller model of the Da Vinci sculpture that took 500 years to come to life.

Once in a state of dilapidation, this candy-inspired fortress is now being revived.

Tucked behind New Jersey's abandoned Gingerbread Castle lie the eerie ruins of a once-flourishing paper mill.

This hospital fell into ruins after failing to act as the advocate for the mentally ill it was designed to be.

Home of the golf club used by Alan Shepard on the moon, and more artifacts from the sport's history.

A park full of outsider art, created by college students studying outsider art.

Whimsical artist house in the New Jersey woods.

The internal railway of one of the biggest steel plants in America has been transformed into a linear park with unique industrial views.

Hundreds of glow-in-the-dark objects light up a museum in a historic zinc mine.

The only thing better than tubing down New Jersey's scenic Delaware River is doing so while eating a hot dog from a giant floating stand.

Mysterious rocks that ring musically when struck.