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

A derelict bit of transportation infrastructure hidden in the woods.

A lovely aquatic park built by a one-armed Civil War veteran who made a fortune from lotuses.

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

A painfully obvious spy house sits right across the street from the Russian Embassy.

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

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

These unusual rooms on wheels are holdovers from the 1960s.

This church built atop a gas station promises to "equip you for the next stage in your life’s journey."

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

The final resting place of an unidentified revolutionary soldier sits behind a Virginia church.

The controversial urban planner who designed Washington, D.C., was buried in Maryland, and can presently be found in Virginia.

Once forgotten and built over, this historic Black cemetery now houses a poignant memorial.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

This campus chapel is Robert E. Lee's final resting place and a topic of debate about the legacy of the Civil War.

Thomas Jefferson's estate is home to hundreds of varieties of historic fruits and vegetables.

The tomb was guarded by soldiers from both sides of the war, and some left their initials carved in the brick.

Soldiers were buried next to Lee's house in the center of Arlington Cemetery to dissuade the general from reclaiming his property after the war.

The graveyard holding the remains of George Washington's slaves was forgotten for nearly 200 years.

This lovely picnic spot featuring thunderous jet landings is an aircraft spotter’s dream.

America's first federal monument.

This stately building in Alexandria, Virginia was built by Freemasons to honor one of their most famous members.

An innovative attempt to break a siege in the American Civil War still scars the earth today.

This colonial tavern played host to George Washington, Thomas Jefferson, and other famous early Americans.