The only working large-scale tea plantation in the United States.

The naval commander’s proudest moment in battle is memorialized in this unique tomb at Arlington Cemetery.

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

The only place for a truly presidential dram.

A former major munitions plant that has been converted into a sprawling art space.

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

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

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

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

At 207 feet, one of the world's longest continuous escalators.

On the Fourth of July this area will transform into a Pompeii-like storm of falling embers and ash.

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.

Disks are rolled out onto the south lawn to absorb the impact of Marine One's wheels like giant coffee coasters.

A line of blue paint marks the route of the inaugural parade.

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

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

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

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

Was there a small "backpack nuke" hidden in the attic? JFK apparently thought so.

This seemingly out-of-place gas station by the Watergate hotel was once described as the most expensive gas station in the world.

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

Daily lunch spot for many of Washington, D.C.'s cab drivers.

Before Nixon, "watergate" meant canals.

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