An overlooked oasis of quiet on the grounds of Washington's monumental basilica.

Housing the National Women's Party since 1929, this historic house is now a monument to the fight for gender equality.

A haunting tribute to pioneering photographer Clover Adams.

Home to a vast and influential collection of Shakespeareana.

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

Largest Roman Catholic church in North America.

Government testing at the asylum briefly explored using marijuana as a "truth serum" on Nazi prisoners of war.

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

This lonely waterfront memorial to the men of the Titanic was erected by the "Women of America."

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

A historic estate packed with George Washington's heirlooms, and its own nuclear bunker.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

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.

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

A Spiritualist house of worship where believers communicate with the dead in the spirit world.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

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

The United States Capitol's former columns still stand.

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

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

Volcanic stone sentinels stand watch at a Korean Bell Garden in Virginia.

One of New York's best collections of pinball is hidden in a secret bar in the back of this laundromat.

This hidden art nouveau gem was designed by an architect in search of a national style.