A planet-hunting astrograph built in the 1920s to seek out the so-called "Planet X" beyond Uranus.

The final resting place of the businessman-turned-astronomer who helped discover Pluto stands near his observatory.

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

A classic Route 66 landmark that was built with scrap lumber and is held together with kitsch and puns.

The remains of a boarding school designed to forcibly assimilate Native American children.

This huge dam across the Colorado River caused an armed standoff between two U.S. states.

This immigrant bridge once spanned the Thames but is now a fixture of an Arizona city.

More than 25 fully functional scale replicas of famous lighthouses dot the shores of Lake Havasu.

Don't blink or you'll miss it.

A tribute to the statues of Easter Island along Route 66.

This once-booming Gold Rush town is now home to a herd of feral donkeys.

A secret fresh water spring for animals and humans alike hidden along the most famous road in the United States.