A cave's rare beauty held a cavernous secret hidden underground.

This fast-food outlet is the only space and UFO-themed McDonalds in the world.

Giant origami sculptures tucked into desert scenery beckon passers-by to explore further.

A futuristic temple of light uses prisms and rainbows to create an atmosphere of peace.

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

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

A museum dedicated to the alleged Roswell Incident.

This $3 million model train takes you through Chicago, Seattle, and the thousands of miles in between.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

This whimsical Oz-themed park had a wonderful impact on the surrounding neighborhood.

This bridge uses an inverted bowstring truss and is believed to be the only of its kind in the United States.

This unincorporated community in western Ohio got its peculiar name from John "Daddy" Baker.

This stuffed pigeon of war had the very serious name "John Silver" until he lost a leg in battle.

The world's first aircraft factory has been hiding inside an automobile plant for almost 80 years.

The world's tallest doric column is this Ohio monument to a naval victory in the War of 1812.

A headstone tells the sad story of a lost little boy and his pet dog.

The 25th President's marble casket can be visited in this classical Ohio tomb.

An unusual, super-sized grocery adventure awaits in an Ohio suburb.

One of the largest collections of holy relics in the country.

You can walk through the first Boeing Air Force One, which famously carried JFK's casket from Dallas back to D.C.

Inside, ancient treasures. Outside, modern contradictions.

A memorial for an outsider theorist who believed that the planet is actually hollow.

A real flying saucer, contracted by the U.S. Air Force.