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

The unique traffic pattern named for an influential urban planner is also known as the Pedestrian Scramble.

The 72-foot giant escaped confinement in a large patch of mulch only to be reburied in the sandy shores of the Potomac River.

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

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

A river with some unusual, and occasionally dangerous, habits.

This grave marks the passing of a historic Jane Doe whose identity remains a mystery to this day.

This mysterious structure by the Washington Monument is a flood barrier designed to protect the White House against rising waters.

An original apothecary from 1792.

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

This small pedestal marks the spot of the first lot of land sold in Alexandria, Virginia in 1749.

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

A much-maligned monument to teetotalism.

The 28,000-year-old specimen is remarkably intact.

D.C. once had its own tiny rival to the New York Stock Exchange.

Legend has it that President Grant’s frequent drinking in the lobby gave rise to the term “lobbyist.”

The U.S. Fish Commission’s effort to mass produce carp.

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

The narrowest house in America is seven feet of pure spite.

Taste the white whiskey that the United States' first president once distilled and enjoyed.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

Seemingly unremarkable items like empty sushi trays, chef hats, and freshness stickers are being preserved so future generations can look back on this beloved cultural import.

The most decorated dog of World War I is preserved in the Smithsonian.

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