Long buried under the 20th-century landscape, this lift lock of the Alexandria Canal is the lone remnant of an ambitious early American transportation project.

The "Sultan of Swat" once attended a school at the site of this baseball field.

A small and somewhat hidden memorial to 68 local veterans of the Vietnam War.

The former home of the woman who successfully fought to integrate restaurants in Washington, D.C.

Washington D.C.'s most famous pianist, composer, and bandleader still tickles the ivories outside Howard Theater.

A 14-foot monument marks the resting place of two of the town's earliest residents—and one unknown soldier.

The former home of Lillian Evans Tibbs and her grandson, Thurlow Evans Tibbs Jr., whose prodigious contributions to music and art spanned more than 90 years.

Built to defend Washington D.C. during the Civil War, this fort became a post-war nucleus for a thriving Black community.

The world's oldest soul food restaurant is also one of its best.

Home to two notable early-20th-century Black educators, Lucy Slowe and Mary Burrill.

One of the first Second Empire-style buildings constructed in North America.

"Congress may voluntarily remain in session throughout the summer, in order that our Congressmen may be protected from the intolerable discomforts and dangers of the ordinary outdoor weather!”

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

After his presidency, George Washington planned to live only a few blocks from the Capitol building.

Four bald cypress trees in Lafayette Square, across from the White House, mark the southern edge of a 100,000 year old cypress swamp.

This apartment building designed by a notable Washington D.C. architect housed the Qing Dynasty's Legation.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

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

Metal dinosaurs lurk in a sculpture garden on the outskirts of a popular resort town.

This one-room schoolhouse was revitalized in 2007 as a museum focusing on the education of Black children during the early 20th-century.

Get up close and personal at this Fresnel Lens.

This 29-ton granite ball spins around at the slightest touch thanks to a scientific phenomenon.

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