One of the Eight Wonders of Kansas and the first official National Natural Monument these stark formations look like nature's Stonehenge.

A towering tribute to decisiveness stands on the spot where Brigham Young and his followers decided that this must be the place.

A 90-foot-tall psychedelic "tree" on the side of the highway has baffled passersby for decades.

Largest man-made excavation on earth!

Oddly shaped rock formation, misassociated with a nearby utopian community.

Step into the cool deep past and unknown future of who begat who.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

This concert pavilion on the shore of the Great Salt Lake has been destroyed by fire, water, and disinterest but keeps coming back.

Come for the speed, leave in love with the desert.

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

This rugged area of red rocks and arches is often considered one of the most beautiful places on Earth.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

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

A portion of the old Pirates stadium over which a defining home run once flew still stands even after the rest of the stadium was torn down.

Meet your friends, marry your true love, or tell your enemies to kiss your butt under this historic Pittsburgh timepiece.

A model of a dinosaur that was named for Andrew Carnegie stands outside the museum that also bears his name.

This dramatic rail curve was once the target of a failed Nazi attack.

Steepest flood safety railway in the entire world.

These disused steel furnaces are now haunting ruins that may one day be a national park.

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

This Pennsylvania cave holds evidence of the oldest known inhabitants of North America.

The largest university building in the West is a gothic masterpiece containing dozens of theme rooms based on different countries.

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

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