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

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

This unacceptably tall building was the real reason for Washington, D.C.'s skyscraper ban.

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

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

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

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

A wondrous old library overlooking the nation's capital.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

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

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