The innocent intentions of this monument are somewhat lost in the sculpture's muscled imagery.

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

A little marble compass above George Washington's (empty) tomb in the Capitol marks where D.C.'s four quadrants intersect.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

The walls of the iconic dome are hollow and have a secret stairway.

Washington's iconic carousel has a nice piece of Civil Rights history.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

Home to items never before seen by the public.

The land is home to swimming ponies and a legendary 18th-century treasure.

The taxidermy remains of the most popular pony in children's literature.

Down the road from where the Wright brothers lifted off is another flight tribute practically hidden from sight in the woods.

The Cadillac Ranch for monster truck aficionados.

Beautiful Gothic-inspired lighthouse stands out among the run-of-the-mill striped fare on Bodies Island.

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

The first car-centric shopping plaza in the U.S. brought a little bit of Spain to downtown Kansas City.

Four, 18-foot-tall badminton shuttlecocks lie scattered about the lawn of a Kansas City museum.

The oldest continuously occupied public building in the United States.

This innocuous New Mexico storefront was once the secret jump-off spot for Manhattan Project scientists.

Wedding chapel's mysterious spiral staircase said to be miraculously constructed.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

Twice a year, visitors can tour the desolate site that birthed the Atomic Age.

This is one really big nut.

The final resting place of the living embodiment of the famous Forest Service symbol.

Nine of the very few concrete ships ever made in the U.S. are beautifully decaying off a Virginia pier.