Decades before the scandal, this staircase on the river was a literal "water gate."

An atomic bomb-proof strongbox protects the U.S. Constitution from terrorists and thieves.

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

The oldest continuously operating fish market in the United States.

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

The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

During the Industrial Revolution this “Temple of Invention” was full of intricate miniature machines and gadgets.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

Home to items never before seen by the public.

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

A second generation sun-powered marvel lights up the night.

Remains of a Greek freighter trapped off of Rocky Point in 1961.

A "haunted" landmark on the coast of Southern California.

The fifth-longest natural arch in the world, and the longest outside China.

Local lore holds that Butch Cassidy took an escape route through Red Canyon's sandstone hoodoos after an attempted murder.

A tunnel with windows, so you don't miss out on the impressive views.

The unusual patterns in this rock formation result from two distinct modes of weathering.

Erosion and various mineral deposits give this striking canyon its distinct color and soft appearance.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

Dramatic river bend surrounds a natural red-rocked pedestal.

Wayne Newton's sprawling estate is now open for visitors to catch a glimpse of his "heart and soul."

A 90-year-old underground water reservoir offers a more industrial kind of tranquility.

A park filled with vibrant mosaics created by more than 300 folk artists.

One man's homage to the orange as realized through a long-term folk art labor of love.