This raised bulls-eye visible from space was the subject of an intense geologic controversy.

Few things look more out of place than the electric blue ponds in the reddish-brown desert of Utah.

The fifth-longest natural arch in the world, and the longest outside China.

Bizarre lunar-like landscape with thousands of large stone "hoodoos."

Inside this church is an obscure piece of art carved by the famous Alice Liddell.

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

It's a unique monument honoring a great character who inspired a generation of young women to be more and pursue their dreams.

The record holder for the world’s largest peach.

Part of a worldwide art project, this mysterious semicircle of concrete shapes holds the pieces of a larger story.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

Nature and art meet in this curvy creation

Tucked away in the forests of Indiana resides an abandoned waterslide that is now a popular graffiti haunt.

L. Frank Baum wrote part of the "Wizard of Oz" series in this wooden Victorian beach resort.

Quite simply the largest tree in the world (by volume).

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.

The world's longest known cave system.

There is no trying to fall in love with this Star Wars fountain, you just do or do not.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

A huge musical instrument played by the ocean.

The oldest operating Mississippi River–style steamboat still navigates the Ohio River.

Symbolic attempt to overcome the issues of life.

The remnants of this unusual bridge await an uncertain fate.

The stoic structure boasts a whimsical set of stained glass art commemorating Lewis Carroll.