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

Belly up to the bar in Cowtown, don't forget to buy some boots.

The second largest roadrunner in the world stands 11 feet tall in his West Texas town.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

Wee (and not so wee) footprints that insects and reptiles of the Paleozoic Era left behind.

A half-acre utopia in the New Mexico desert features a graveyard, a game of horseshoes, a library, and a mailbox.

The outcropping is graffitied with the name of the beloved musical Muppet television series.

The arboretum whose marshy soil sucked up the dreams of housing developers.

A remnant of the last Ice Age, this lake is surrounded by fascinating rock formations.

The watery grave of an impractical idea.

Half of a waterfall goes into the river while the other half seems to disappear.

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

The last physical evidence of the Lewis and Clark trail is one of their autographs etched into this giant rock.

This giant roadside goose has been hailing travelers into a small Ontario town for over 50 years.

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

The site of a 19th century "dream city" that almost rivaled Chicago before being swallowed by the Indiana sand dunes.

Rows of 19th-century brick ovens used to process coal into coke form the center of a wooded park.

A stone arch leads to a cavernous 1930s spring house tucked away in the Pennsylvania woods.

Profile of a sleeping person four kilometers long in 250-meter-high cliffs.

An ice cream parlor chain that caters to vegans and pinball fans equally.

A smoke stack so large, the Washington Monument could fit inside!

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

The only way to see Pittsburgh is from the top of this lookout point, just like the ancient members of the native peoples did.

This secluded walking trail is a hidden gem of a Pittsburgh park.