This California tree is the single source of the state's entire orange industry.

This was once the home of Gahan's Saloon, Denver's most storied speakeasy.

After a short-lived attempt to bring America in line with the rest of the world, this road was left in metric.

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

This otherworldly church spire reaches up toward the heavens.

Stairs often replace streets on the steep slopes of this old mining town.

While not recognized by Guinness, this chocolate waterfall is likely to be the world's largest.

The oldest operating cemetery in Denver is the eternal home of some of the Centennial State's most famous residents.

Once America's tallest structure, now a Baltimore landmark.

Final resting place of a 19th century gold prospector and convicted cannibal.

A double agent hid information for the Soviet Union beneath this bridge for more than 20 years.

One of the largest helium balloons in the U.S. is a 112-foot ginormous orange.

This mysterious petroglyph evokes the ancient swastika symbol but was later vandalized with the more troublesome Nazi one.

Unique tower has outlasted a takeover of the company.

Every Christmas, one Arizona city makes the most of its dry climate by creating an arid desert tannenbaum.

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.

A monumental statue of RCA's mascot now sits atop a historical society roof after a life of moving around.

An historic and oft-filmed spot for musclebound iron pumpers on the Pacific coast.

This bug-eyed water wheel uses the power of the Sun to clean up Baltimore Harbor.

The narrowest house in America is seven feet of pure spite.

This poor little statue is the most vandalized memorial in Washington.

A bronze statue on a downtown corner honors Minneapolis's favorite career gal.

The only arched bridge made of stone on the entire Mississippi River.

Happy harbor seals frolic and snooze on this warm, sandy stretch of coast.