This bug-eyed water wheel uses the power of the Sun to clean up Baltimore Harbor.

This statue honors the author's groundbreaking family story.

The land is home to swimming ponies and a legendary 18th-century treasure.

The origin of this mechanical boy was a mystery until he revealed his maker by writing it in perfect cursive.

A tour de force of a fountain, memorializing a man who loved fountains more than anything else.

Home of the only civilian casualty at the Battle of Gettysburg.

Washed out by the Johnstown Flood in 1889, the surviving portion of the original two-span bridge now resides at Fishing Creek.

First built around 1848, this bridge was destroyed by arson, but original timbers are included in the replacement.

The smallest covered bridge in Maryland.

This spectacular track has run continuously since 1882.

A unique geological area spiked with wind-carved rocks that resemble teepees.

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.

This pseudo-steampunk weapons facility is the world's largest wood and glue structure, and packs quite a wallop.

The official atomic museum of the United States explores the explosive and productive history of a much maligned energy source.

This iconic science fiction house still looks like something from the future.

If drivers cross the rumble strip on this stretch of Route 66 at just the right speed it plays "America the Beautiful."

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

A small metropolis of Pueblo cave dwellings have been carved right into the hillside of this national monument.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

Wedding chapel's mysterious spiral staircase said to be miraculously constructed.

The oldest continuously occupied public building in the United States.

This innocuous New Mexico storefront was once the secret jump-off spot for Manhattan Project scientists.

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

A house turned museum is the real-life "home" of the fictional main character of The Wizard of Oz.