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

Art deco landmark on the outskirts of Washington, D.C.

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

An atomic bomb-proof strongbox protects the U.S. Constitution from terrorists and thieves.

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

The most accurate timepiece in the world.

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

Decades before the scandal, this staircase on the river was a literal "water gate."

Before Nixon, "watergate" meant canals.

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

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

Go take a picture with the inventor of the daguerreotype photographic process.

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

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

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

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

The Byzantine, pre-Columbian, and medieval art at this stately mansion are some of the most under-appreciated collections in D.C.

A line of blue paint marks the route of the inaugural parade.

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

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

The little-known, 300-year history of the area includes former lives as a bustling tobacco port, parking lot, and industrial dump.

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

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

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