Edgar Allan Poe's old dorm is now a shrine to the author's legacy.

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

Rediscovered after a century, the father of the American Navy was reinterred in something dredged up from Davy Jones’ locker.

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

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

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

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

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.

The most accurate timepiece in the world.

A historic arena where the Beatles played their first concert in the U.S.

One critic described it as "middle Mussolini, early Ramses, and late Neiman-Marcus." Another called it an architectural "natural disaster."

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.

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

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

Need a hardcopy of the 50-title Code of Federal Regulations? This is the place.

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

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

The house where John Wilkes Booth conspired with his co-conspirators.

The grand marble structure next to the White House is Andrew Carnegie's temple to Pan-American diplomacy.

This seemingly out-of-place gas station by the Watergate hotel was once described as the most expensive gas station in the world.

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

The bank that helped fund the Mexican-American War and the purchase of Alaska met its downfall after helping Augusto Pinochet launder money.

This lovely, if imposing, piece of Canadian gothic is possibly the most photographed hotel in the world.

A hotel and restaurant serving as the mecca of kitsch.