This improbable contraption was passed down through five generations of industrious Tennesseans.

One of the few working locomotive roundhouses in the United States.

One of the world’s largest living advertisements is made out of pine trees.

A physical reminder of Earth's ancient past, this rock results from the photosynthetic processes of some of the oldest forms of life.

A cemetery where many of those buried had a flair for the dramatics.

This multisensory alley has the ability to remind bustling citygoers to stop and smell the roses.

The largest earthwork effigy in the world.

The inventor of a number of hybrid corn species is immortalized with a field of giant corn.

These sub-farmland caves are home to a majestic stalactite known as the "Crystal King."

A real flying saucer, contracted by the U.S. Air Force.

This bridge uses an inverted bowstring truss and is believed to be the only of its kind in the United States.