The only surviving prototype for Buckminster Fuller's house of the future.

Astounding collection of coin-operated games and automata.

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

The site of the climactic scene from the classic horror film is now a historic landmark.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

The "lovely red Vega" of the legendary record-settling pilot.

A super-sized promotional trick that is now a D.C. landmark.

A traveling postal dog covered 48 states and more than 140,000 miles, and he lives on as taxidermy, patched up with a rabbit's foot and a pig's ear.

Giant acorn-shaped 19th century gazebo from which suburban Washingtonians gazed upon the original "silver" spring.

The United States Capitol's former columns still stand.

Eighty million natural history specimens call this gargantuan museum home.

A girls' boarding school inspired by the Chicago World's Fair, once abandoned, now restored to strange and scenic glory.

This famous city eluded concrete detection until the early 2000's.