An old spiral fire escape dangles above a public courtyard in Midtown Oklahoma City.

This unique landscape is the only place in the world to dig for hourglass-selenite crystals.

A series of silhouettes that recall the great cattle drives of the 19th-century.

Sitting in the arguable birthplace of the Wild West, this museum holds the largest collection of bronco busting bric-a-brac in the world.

Though it's no longer a functioning train depot, this castle-like structure is an important piece of Oklahoma history.

This abandoned, windowless concrete block is one of the strangest buildings in Tulsa.

This massive Art Deco-inspired mural was the world's largest augmented reality artwork at the time of its completion.

This beacon for pre-radar pilots once guided Charles Lindbergh to a safe touchdown in Tulsa.

A natural rock formation believed to be a cure-all.

A whimsical tower with a spiral staircase, inspired by the Space Age and the Möbius strip.

A detached cement mixer has been transformed to resemble a relic from some obscure NASA mission to Oklahoma.

A likeness of Da Vinci's mysterious painting smiles at passersby from the side of a barn.

Three markers installed over the course of 140 years mark the point where Arkansas, Missouri, and Oklahoma converge.

This unusual sculpture honors the city's namesake, Octave Chanute, for his pioneering work in early aviation.

A Google software engineer's Easter egg led to what may be the world's most unusual saved screenshot.

This historical marker is all that remains of Octagon City, Kansas, a failed vegetarian utopia.

It's hip to be square in Iola, home of the largest town square in the United States.

This massive marble memorial was built bit by bit either out of devotion or spite, but at the expense of the surrounding town.

Explore the cabin where the famed abolitionist once lived and the site where he fought the Battle of Osawatomie.

How did the front of a supersonic jet make its way to a display case in a Kansas City yard?

An art installation commemorates journalist Nellie Bly's undercover reporting inside a New York asylum.

From cartoon characters to tiny tanks, a guerilla sculptor's little bronze statues are hidden throughout the city of Budapest.

In the Compton Hill Reservoir Park sits a statue whose lack of clothing caused a scandal for the group that commissioned it.

A brass and marble scale model of the solar system embedded in the concrete.