Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

The largest earthwork effigy in the world.

A once-booming Mississippi River town with a history of racial violence is now eerie and mostly abandoned.

The lowest point in the state of Illinois, at the confluence of the Mississippi and Ohio rivers.

The world’s largest truck stop includes a barber shop, chiropractor, and a huge museum with antique trucks.

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

Millions of dollars worth of sculpture decorate this Iowa city center.

Once the "Eighth Wonder of the World," this iron railroad bridge was decimated by a tornado.

Oversized statues are just the tip of this nostalgic Americana roadside attraction.

Less a museum than a bizarre fantasy world created by artists and engineers.

The grave of the iconic Kentucky Fried Chicken mascot features a bust of the man behind the goatee.

The spectacular collection of one of the world's best woodcarvers.

An office built to look like a giant basket.

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

A monument to the Mohawk people stands along an old Native American trade route.

In order to save this beloved rock, locals blew it up and put it back together piece by piece.

The oldest playground in America.

In a town that's had a whole lot of giant chairs this one still stands tall, just not the tallest.

This historic Boston building has gone from personal estate to porn theater and back again.

The nation's second-ever First Lady urged the founding fathers to "remember the ladies."

Each August, one of the largest religious (and food) celebrations in the country is held in Boston.

The Atlantis of Cape Cod reemerges during the lowest of tides.

The tomb of Increase Mather and his son Cotton, influential colonial ministers obsessed with the occult.

"Mock all and sundry things, but leave the saints alone."