This volcano rises like a giant anthill from the plains below, with a road spiraling up to the rim.

This unassuming layer of clay boasts an out-of-this-world origin story.

This bronze sculpture on a former squash court marks the secret origins of the Atomic Age.

The NBA player's elaborate former home is now a ghost of its old glory.

An acoustic anomaly with a mysterious cause.

A half-size replica of the World Trade Center towers above Tulsa.

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

Standing at 21-feet tall, this space cowboy adds to the legacy of Route 66's muffler men.

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

These massive mitts are made of 30 tons of devotional bronze.

One of New York's most iconic authors is strangely honored by this Oklahoma park.

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

The only remains of a 1918 section of Route 30.

Largest man-made excavation on earth!

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

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

A replica that won't float away.

This off-the-beaten-path abandoned town is a relic of Montana's silver mining boom.

One home in the historic strip hides secret compartments and the ghostly songs of long-gone canaries.

The old fire tower is one of the last of its kind in the United States.

Modeled after a famous church in Vienna, Austria—but in Helena, Montana.

Not-so-fearsome tiny trolls live under this wooden train trestle in Portland.