This water tower slanted at an uncomfortable angle off the old Route 66 was an ingenious marketing ploy.

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

In the remote high desert of New Mexico, a strange array of poles beckon fury from above.

This is one really big nut.

More than 21,000 images fill this overlooked gem of a prehistoric site.

A total of 14 men held the title of "president" before George Washington—their historical legacies are enshrined in the lobby of a hotel.

The 72-foot giant escaped confinement in a large patch of mulch only to be reburied in the sandy shores of the Potomac River.

An experimental, automotive replica of Stonehenge.

This erect, phallic geological spire wasn't always named so domestically.

The wreckage of a World War II bomber is hidden high in the Colorado wilderness.

A popular rock that acted as a waymarker for American pioneers.

A collection of fading fantasy tchotchkes lines this dirt road in the Colorado wilderness.

A monument to the egos of two railroad magnates that fell into decline along with their careers.

The high point on the 16th president's eponymous roadway is marked by a massive version of his head.

Miraculous tree that seems to sprout out of solid rock.

Population: 1.

The secret city built by the Manhattan Project.

Knoxville’s architectural icon was the symbol of the 1982 World’s Fair, even catching the googly eye of Bart Simpson.

A wonderland of folk art including the World’s Largest Grit. 

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

This vast kitty-themed collection illustrates the history of human-cat interaction.

In one of America’s oldest mountain ranges, a long-awaited section of a scenic highway is now open to the public.

One man has spent decades faithfully constructing this unique brick and cinderblock castle.

The only zoo where you can buy animals that won't need feeding.