The world's only teal arches exist in a city that cares more about its aesthetic than an Instagram influencer.

A monument to the one-armed geologist who led the first documented expeditions through the Grand Canyon.

This immigrant bridge once spanned the Thames but is now a fixture of an Arizona city.

This golf ball–shaped former desert real estate office now houses a UFO museum.

Ancient pueblos built into the base of a natural canyon wall.

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

This historic national park is covered in the stunning ruins of red rock pueblos.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

Rippling sand dunes frozen in the Arizona rock.

Dramatic river bend surrounds a natural red-rocked pedestal.

The fountains of the U.S. Navy Memorial are annually salted with water from the Seven Seas as part of a nautical ritual.

There just so happens to be a court even higher than the U.S Supreme Court: a basketball court in the building itself.

A diminutive plaque recalls the treetop sniper who almost killed Abe Lincoln.

Senators used to relax in the nearly forgotten marble tubs now hidden in the U.S. Capitol Building's basement.

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.

An overlooked oasis of quiet on the grounds of Washington's monumental basilica.

Perhaps the most scandalous statue of America's first president.

A super-sized promotional trick that is now a D.C. landmark.

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

This lonely waterfront memorial to the men of the Titanic was erected by the "Women of America."

Fittingly, America's museum of architecture is itself a magnificently designed old building.

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

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.