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

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

The story behind the mysterious symbol painted in front of the historic university's famous Rotunda.

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

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

Extraordinary objects lurk in this quintessential regional museum.

Rumor has it the hot dog stand was targeted by two Russian nuclear missiles.

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

An enormous warehouse filled with parade floats collected from over 50 years of patriotic celebrations.

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

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.

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

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

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

The Virginia farm where John Wilkes Booth met his grisly end is now largely forgotten.

An extensive, if one-sided, history of U.S. law enforcement's war on drugs.

This pre-Revolutionary War grist mill ground corn and flour for soldiers in seven American wars.

This unique historical monument features large concrete spheres designed to resemble fallen stars.

America's first public mental health facility.

The final resting place of two (or three) presidents, one vampire, and 18,000 Confederate soldiers.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

FDR's Art Deco hospital tower was hopelessly inefficient.

This rare triple-jurisdiction drawbridge passes through Virginia, Maryland, and Washington, D.C.