The only National Monument ever to go missing for nearly 50 years then resurface in a dump.

An overlooked memorial honoring the local Washington residents who died in World War I.

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.

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

Go take a picture with the inventor of the daguerreotype photographic process.

An unassuming, powerful monument north of the U.S. Capitol bears witness to the resilience of Japanese Americans during a time of grave injustice.

Rumor has it the uncarved lump behind the three famous suffragists is reserved for the first woman president.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

One of the world's tallest Ferris wheels takes visitors high above Las Vegas in a spinning party room.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

This sandwich shop has a century-old elevator behind a sheet of plexiglass.

A historic estate packed with George Washington's heirlooms, and its own nuclear bunker.

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

Look closely and you’ll notice that the color changes a third of the way up the tower.

D.C.'s first central library was born out of a chance encounter with the philanthropist whose name it bears.

This nine-story building is the oldest standing skyscraper in D.C.

The romance of early commercial flight still fills this Art Deco destination.

A much-maligned monument to teetotalism.

In the middle of the desert, miles from any human life, sat an anomalous pay phone that still magically answers your calls.

Finally the worlds of UFO enthusiasts and beef jerky lovers have come together in this roadside shop.

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

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

Corn-inthian columns with a uniquely American take on neoclassical architecture.

A muscular Art Deco monument represents the struggle between regulators and unbridled markets.