A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

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

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

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

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

An original apothecary from 1792.

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

Born a slave on the Arlington estate, Parks dug the first graves at Arlington National Cemetery, and was buried there, too.

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.

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

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

Located at the former Lorton Prison the Lucy Burns Museum tells the story of the 91 year history of the prison including the dark chapter of its involvement in the women's suffrage movement.