The Cold War-era "underground Pentagon" is a sprawling subterranean hideaway for the Defense Department.

A quirky collection of outsider art made from automobile parts.

The Pennsylvania landscape depicted by a quarter mile of mosaics made from used road signs.

This titanic java kettle is one of the many kitschy landmarks located along America's OTHER famous highway.

Once the "Eighth Wonder of the World," this iron railroad bridge was decimated by a tornado.

An abandoned stretch of highway, deteriorating next to the operational one.

The record holder for the world’s largest peach.

After a water tower painting was accused of being an ad, a simple fix was made that gave the city a motto.

The Old Man of the Mountain’s less-famous, but still beloved little brother is said to resemble a leader of the Abenaki tribe.

The massive Roman arch in New Hampshire that was meant to be a tomb.

Maybe the only missile installed in a public park, this Cold War leftover was one of the first to carry a nuclear warhead.

A small park commemorates the departure of the first-ever successful transatlantic balloon voyage.

This 19th century granite fortification is one of the most well preserved forts in New England.

True to its name, this bouncy walkway may be the world’s smallest suspension bridge.

Pennsylvania's own Roswell-style UFO mystery.

This 16-foot-diameter wooden coin has been standing in Iowa City since 2006.

No one knows the origin of this small town’s unique name.

The World's Largest Bull.

The world’s largest truck stop includes a barber shop, chiropractor, and a huge museum with antique trucks.

A warning to the weak-kneed: This narrow bridge does its swinging eight stories high.

A devilishly named gorge that was a sign of salvation for many pioneers.

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

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

A small car graveyard sits in the shadow of the famous Cadillac Ranch.