Marking the spot where a conquistador gave up his search for the fabled Seven Cities of Gold.

A unique blue and yellow phone booth in America's "Little Sweden."

The United States's largest hand-dug well is topped with a state-of-the-art museum.

One of the Eight Wonders of Kansas and the first official National Natural Monument these stark formations look like nature's Stonehenge.

A whimsical monument marks the highest point in Kansas, not that you could tell by the looks of it.

A Texas cave network is home to some of the world's most spectacular-looking and bizarrely named mineral formations.

The largest self-built castle in the U.S., six decades in the making.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.