Once the largest gravity dam in the world.

A masterpiece of Art Deco architecture hidden in plain sight in West London.

Fresh wooden posts have been added to ancient holes to recreate a primitive henge clock.

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

A restored Pittsburgh house of God has been converted to a marvelous house of suds.

A giant lumpy candle serves as a beacon for this highly scented pit stop.

Known as the "Cross At The Crossroads," this massive metal cross is just short enough to avoid the FAA.

Less a museum than a bizarre fantasy world created by artists and engineers.

A creepy sculpture of a decapitated head invites viewers to see St. Louis through its empty eyes.

A plaque on the side of a parking garage marks the burial place of a great Ottawa chief.

The Old Courthouse takes visitors on a captivating trip through St. Louis' timeline.

This statue is an ode to an iconic roadside advertisement popularized during the 1970s.

A mysterious light of unknown origin on the backroads of Missouri.

Nature's biggest mammal swims in landlocked Oklahoma.

It reportedly took three years to sort through all the objects in this eclectic lifelong collection.

Standing at 21-feet tall, this space cowboy adds to the legacy of Route 66's muffler men.

A half-size replica of the World Trade Center towers above Tulsa.

Once in disrepair, this popular Texas stop along iconic Route 66 has been restored to its past glory.

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.

The old Route 66 town straddling Texas and New Mexico died along with the Main Street of America.

The top of a giant mesa, just outside of Amarillo, appears to float in the sky above.

This constitutionally sound Muffler Man harkens back to the days these attractions were a must-see.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.