Here's a peek inside Washington, D.C.’s Mansion on O Street

It’s Northwest D.C.’s best kept secret, with more than 100 rooms and more than 70 secret doors and passageways. In this edition of “Matt About Town,” WTOP’s Matt Kaufax takes us to Dupont Circle, to explore the Mansion on O Street. Full story here: wtop.com/gallery/dc/wtop-takes-a-peek-inside-dcs-m…