The stones of this Incan wall complex fit together so well you couldn't fit a piece of paper between some of them.

The largest prehistoric ruins south of the Sahara, once a powerful center of international trade.

Twenty-year effort to raise a castle using tools and techniques from the 13th century is now abandoned in the Arkansas woods.

The ruins of this antebellum sugar plantation are the end result of a Seminole attack during the Florida Wars of 1836.

The ancient tomb acts as a calendar that keeps perfect time.

Some of the tallest ancient American ruins continue to inspire awe and curiosity.

Ancient pueblos built into the base of a natural canyon wall.

The interior of the Overlook Hotel in "The Shining" was based on this Yosemite original.

Most famous work of one of Frank Lloyd Wright's sons.

This hilltop park offers magnificent views and a Frank Lloyd Wright masterpiece.

A Biblically-based Natural History Museum.

A couple turned their front yard into an artistic masterpiece.

Lemon Grove, California is known for its giant lemon...and mummified bodies.

Swarms of butterflies cannot compare to the awe inspired by the publicly-funded nakedness once displayed in this sunken garden.

A multi-storied adobe complex has been inhabited for more than a thousand years.

This southwest-styled home in Santa Fe claims to be the oldest house in America thanks to an ancient bit of foundation.

Despite time, colonization, and the brutal New Mexican heat, these Pueblo ruins still stand.

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

The scene of one of the darkest moments in American labor history has been left essentially untouched since the tragedy.

A crumbling wizard is one of the final reminders of a roadside Middle Earth.

Bits and pieces from the ill-fated Donner Party's winter cabins.

The Empire Mine is "one of the oldest, largest, deepest, longest and richest gold mines in California."

Established in 1853, this crumbling cemetery sits forgotten on the corner of Church and Chapel in Gold Country.

While it is not equipped to peer into outer space this observatory looks like it was built on the moon.