The grand marble structure next to the White House is Andrew Carnegie's temple to Pan-American diplomacy.

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

The little-known, 300-year history of the area includes former lives as a bustling tobacco port, parking lot, and industrial dump.

This seemingly out-of-place gas station by the Watergate hotel was once described as the most expensive gas station in the world.

A historic ruin just 20 feet away from a busy highway onramp.

Electrical pylon in the shape of Disney's beloved mouse.

This giant steer-skull edifice refuses to die.

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

A reproduction of earth's many biomes.

This southwestern historic site was designed and built by an artist who wanted his work to "feel at home."

Miniature art that tells an enormous story.

Sleep where gangsters fell amidst smoke and flame, with nary a bullethole to show for the legendary struggle.

In Tucson a giant metal snake helps pedestrians cross a busy highway.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

Eons ago, a rushing lava river formed this pristine passage through solid rock.

Before Metro, Washington had a robust streetcar network—and you see the remains of this infrastructure if you know where to look.

The unusual burial monument of Arizona's first governor.

This striking public art installation is suspended above a public park, designed to gently move in the breeze.

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

A spiritual vortex among the red rocks in Sedona.

The site of the climactic scene from the classic horror film is now a historic landmark.

This grand gothic brewery has been pumping out suds for over a hundred years.