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

The grand marble structure next to the White House is Andrew Carnegie's temple to Pan-American diplomacy.

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

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

One critic described it as "middle Mussolini, early Ramses, and late Neiman-Marcus." Another called it an architectural "natural disaster."

Architecture lovers won’t stop touching the National Gallery's 19.5 degree marble prow.

The oldest continuously operating fish market in the United States.

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

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

Government testing at the asylum briefly explored using marijuana as a "truth serum" on Nazi prisoners of war.

This rare triple-jurisdiction drawbridge passes through Virginia, Maryland, and Washington, D.C.

The 72-foot giant escaped confinement in a large patch of mulch only to be reburied in the sandy shores of the Potomac River.

A 22-foot stainless steel quilting needle pays tribute to a local connection to fiber arts.

A collection of outdoor art by renowned muralist Robert Dafford depicts the history of a flooded city.

Dedicated to a veritable Houdini among P.O.W.s who escaped imprisonment on five separate occasions.

Honoring combatants from Portsmouth who served in Cuba and the Philippines during the Spanish-American War.

A lightship turned museum, outfitted with artifacts from the vessel's past as part of the U.S. Lighthouse Service.

Get up close and personal at this Fresnel Lens.

This tree is a living witness to the beginning of the Civil Rights Movement.

A collection of vehicles across American military history.

Mass grave of 50 unidentified French Soldiers who died at the Siege of Yorktown, 1781, that gave victory to the American Revolution.

The location where the American Revolution ended.

The maritime museum that boasts the largest nautical library in the western hemisphere.

New York City's only wildlife rehabilitation center treats more than 3,000 feathered and furry patients each year.