Home to a vast and influential collection of Shakespeareana.

A haunting tribute to pioneering photographer Clover Adams.

Cold War intelligence agents monitored communist embassies from an attic in a former pigeon coop.

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

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

A rotating cast of guys and dolls in front of a Washington, D.C. building.

The country's oldest continually-operated mini golf course lies hidden in plain sight, eclipsed by one of D.C.'s most popular tourist attractions.

A three-story tower of books about Abraham Lincoln is one of the more unusual monuments to the president.

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

A derelict bit of transportation infrastructure hidden in the woods.

A painfully obvious spy house sits right across the street from the Russian Embassy.

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

A wondrous old library overlooking the nation's capital.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

A historic neighborhood church is reborn as a psychedelic arts collective.

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

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

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

Home to a 27 room house, this estate was crafted by Black entrepreneur Olander Banks Sr.

This homestead was occupied by Union soldiers, who believed the owners were signaling Confederate forces.

A small brick parlor house and artist's studio located in the wilderness is surrounded by imposing suburban palaces.

At Brandy Station, Civil War soldiers left their mark on the battlefield and the walls of this small wooden house.

A massive, majestic mammal watches over pedestrians from his perch atop a former B.P.O.E. lodge.

These figures float and flutter in this fountain crafted by famed Swedish sculptor Carl Milles.