The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

A mysterious monument meant to be a guide into "an Age of Reason" was destroyed after an apparent bombing.

This bright yellow relic is the final survivor of a short burst of seashell-shaped petrol pumps.

A Prada store in the West Texas desert that is never open for business.

This is probably not the Target you're looking for.

The legend of a local monster still haunts this small town.

The "Seinfeld" diner.

Two mammoth statues inspired by equally tall tales lure tourists to this roadside attraction.

An enormous illuminated figure dances on the Las Vegas strip.

A man-made island in scenic San Francisco Bay.

Commonly referred to as the most photographed Victorian home in the United States.

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

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.

A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.

An artsy hidden staircase leads to breathtaking views of San Francisco.

A small chapel celebrating the spiritual bond between dogs and humans.

A museum dedicated to the quirky and colorful world created by Springfield's favorite son.

The trials and tribulations of marking Poe’s grave.

This blue behemoth of a bear is a colorful homage to Brown University's mascot.

Life-size bronzes of the Grinch, Cat in the Hat, Yertle the Turtle, Sam-I-Am, and the Lorax—and the author himself.

An iconic steel and chrome diner from the 1940s left empty for nearly 20 years is in danger of being demolished.

World Trade Center memorial likened to a woman's sexual organ.

Yo, Adrian!