A 400-year-old church covered floor to ceiling in ex-voto offerings from the faithful.

The Argonaute submarine was the French navy's pride and joy in the 1950's.

An iconic and eccentric bar for "Manouche" Jazz music keeps expanding its space—and its influence.

A museum of carnival attractions where you are invited to ride the rides.

A bas relief commemorates the "Nuns of the Battlefield" who cared for soldiers on both sides of the conflict.

Obscure Freemasons still live in D.C.’s largest private residence.

There’s a hidden military meme engraved on the World War II Memorial.

A Civil War fort in the middle of Washington, D.C. has been swallowed by a forest.

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

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

This poor little statue is the most vandalized memorial in Washington.

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.

The United States Capitol's former columns still stand.