The United States' oldest Episcopal church still in active use.

Historic home of America's sweetheart sharpshooter, Annie Oakley.

The elevator hidden in a smokestack on Roosevelt's yacht now serves as a monument to the former president.

One of the earliest and best-preserved buildings in Charles County, Maryland.

This homestead was occupied by Union soldiers, who believed the owners were signaling Confederate forces.

The last early 20th-century schoolhouse in Fairfax County has galvanized the community and engendered a spirit of service among residents.

A small brick parlor house and artist's studio located in the wilderness is surrounded by imposing suburban palaces.

Hidden in the forest atop a long, winding driveway is this stately home.

Captain John Smith thought these cliffs were amazing in 1608 but sharks thought so 20 million years before him.

The last of nine massive kilns that produced many of the red bricks for buildings in Washington, D.C. and northern Virginia in the early 20th century.

A weathered, American Foursquare-style house originally built for lumber merchant William Wimsatt.

This field of concrete was once an active defense site armed with nuclear warheads.

One of the oldest standing structures in Montgomery County, Maryland.

This twice-relocated "Usonian" home is among the smallest built by master architect Frank Lloyd Wright.

The only tennis court that falls under the jurisdiction of the central bank.

For 60 years, the academy had no permanent location until members voted Washington D.C. as its forever home.

A Civil War fort in the middle of Washington, D.C. has been swallowed by a forest.

People escaping slavery may have hidden inside a corpse vault.

A diminutive memorial marks the site of a successful assassination by a right-wing death squad in America's capital.

A massive, majestic mammal watches over pedestrians from his perch atop a former B.P.O.E. lodge.

The semi-reclaimed ruins of this canal were once part of an ambitious plan to reroute the mighty potomac.

The privately owned cemetery that holds room for Washington's finest when they step down from life.

The only remaining African American schoolhouse in northern Virginia is now a museum dedicated to formerly enslaved people.

This pharmacist and his patient greet visitors to the National Community Pharmacists Association.