On the Fourth of July this area will transform into a Pompeii-like storm of falling embers and ash.

The oldest continuously operating fish market in the United States.

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

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

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

Rumor has it the uncarved lump behind the three famous suffragists is reserved for the first woman president.

Home to items never before seen by the public.

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

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

This grand gothic brewery has been pumping out suds for over a hundred years.

A small triangle of DC grass is the final resting place of one of Sonny and Cher's songs.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

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

Washington's iconic carousel has a nice piece of Civil Rights history.

When it opened during the final years of the embargo, all the drinks and cigars were free.

You could be standing at the site of one of D.C.'s most fatal tragedies and not even know it.

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

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

"Congress may voluntarily remain in session throughout the summer, in order that our Congressmen may be protected from the intolerable discomforts and dangers of the ordinary outdoor weather!”

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

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

Look closely and you’ll notice that the color changes a third of the way up the tower.

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

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