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

A replica of the famous memorial statue at the Normandy American Cemetery hides in an office building in downtown D.C.

This nine-story building is the oldest standing skyscraper in D.C.

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

A brass plaque dedicated to a convicted cannibal hangs in the National Press Club, and that's not even the craziest part of the story.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

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

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

An original apothecary from 1792.

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

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

America's first federal monument.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

This is one really big nut.

Yugoslavia's biggest underground airport lies in ruins.