America's first nuclear-powered merchant ship is now a time warp to the atomic age.

Electronic inventions that resulted in products and systems we use every day are on display in this labor-of-love museum.

A remote horde of architectural treasures fit for Indiana Jones.

Built by the patriotic residents of Boonsboro in a single day.

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

America's Most Wanted's set resides in this tribute to the history of crime and punishment.

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

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

This unassuming passageway played a key role in one of the most important events in U.S. history.

A fantastic array of trays and cables once whisked books over to the Capitol at 600 feet per minute.

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

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

Amid the sprawling Defense Intelligence Agency Headquarters is one of Washington's least accessible museums.

For 60 years, the academy had no permanent location until members voted Washington D.C. as its forever home.

Sit where JFK proposed to Jackie or where Nixon dined on meatloaf at this storied pub.

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

Daily lunch spot for many of Washington, D.C.'s cab drivers.

They sort through millions of dollars worth of diplomatic gifts on behalf of the government.

Senators used to relax in the nearly forgotten marble tubs now hidden in the U.S. Capitol Building's basement.

One of the largest artillery pieces in the world sits in a Washington D.C. parking lot.

In the basement of the U.S. Capitol Building is a hidden storage room full of ornate floor tiles leftover from the 1850s.

A hoard of sky catalogs, astrophysical journals, even the works of Galileo and Copernicus.

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

This leafy estate is worth $18 million and is so grand it has two mailing addresses.