The site of Paul Revere's historic two lantern warning.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

The idyllic colonial home of the artist behind the famous portraits of George Washington and Thomas Jefferson.

One of the only Florida forts to remain in the hands of the Union all through the Civil War still stands as a historic stronghold.

This now-deactivated naval base defended the Florida coast for centuries.

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

The only structure left with direct ties to the Salem witchcraft trials of 1692.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

A historic arena where the Beatles played their first concert in the U.S.

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.

Before Nixon, "watergate" meant canals.

The Pentagon sits on a former island that was in Virginia at low tide and D.C. at high tide.

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

The little-known, 300-year history of the area includes former lives as a bustling tobacco port, parking lot, and industrial dump.

The Byzantine, pre-Columbian, and medieval art at this stately mansion are some of the most under-appreciated collections in D.C.

The national park was once a plantation estate.

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

There's a crumbling old mansion inside the Smithsonian National Zoo.

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

The rogue roots are gradually consuming some of the historic marble grave markers.

Perhaps the most scandalous statue of America's first president.

Please don’t anchor your boat onto the Department of Defense’s underwater data cables.

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

Outposts of this restaurant chain were shaped like jaunty chapeaus.