Known as "The Hill of the Little Devils."

This soaring sculpture and Sioux Falls landmark represents the leap of faith taken to make one's dreams come true.

A roadside collection of over-sized iron creations that are a bit more macabre than most.

It reportedly took three years to sort through all the objects in this eclectic lifelong collection.

The only fully-realized skyscraper built by the famed American architect, Frank Lloyd Wright.

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.

A former chicken restaurant that doubled as a speakeasy is now a quirky home full of wonderfully strange traditions.

A Route 66 filling station that was designed to resemble the Hagia Sophia, and is now the symbol of an arts district.

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

An acoustic anomaly with a mysterious cause.

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

The storied steakhouse is the last in a long line of Lebanese-owned supper clubs in Tulsa.

The fifth tallest statue in the United States is a shirtless monument to the oil worker.

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