A museum dedicated to the history and exploration of both popular music and science fiction.

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.

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

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

A bas relief commemorates the "Nuns of the Battlefield" who cared for soldiers on both sides of the conflict.

There’s a hidden military meme engraved on the World War II Memorial.

The "lovely red Vega" of the legendary record-settling pilot.

The rogue roots are gradually consuming some of the historic marble grave markers.

At 207 feet, one of the world's longest continuous escalators.

This Virginia railway overpass is said to be haunted by a serial killer in a rabbit costume.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

These massive mitts are made of 30 tons of devotional bronze.

Officially named the "Loneliest Road in America," this barren stretch of Nevada road offers almost nothing but sky and open fields.

This gallery of prehistoric red ochre art lines the wall of a scenic segment in Utah's San Rafael Swell.

Two massive rock outcroppings on the Oregon coastline.

Despite a legend that says this highest peak in Oregon was climbed in high heels scores of people have died on its slopes.

Only known mainland rookery of the threatened Stellar sea lion.

New fungal and bacterial species call this deadly lake home.

These giant metal horses graze on a hilltop near the Montana highway.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

A replica of a 7th-century church hides in plain sight in the middle of the concrete jungle.

There's a piece of New York City transportation history hidden in plain sight at a Manhattan subway stop.

This Fifth Avenue church has long been the favored worshiping place of Broadway actors and vaudeville performers.

A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.