In which Shake Shack serves a concrete made with doughnuts.

Get excited: Shake Shack announced today that it will open its third D.C. location next year inside the International Spy Museum at Ninth and F Streets NW.

Rumors of tasty hamburgers and thick, candied custard concretes are buzzing today, following a post on Prince of Petworth yesterday that hinted at D.C. getting its second stand-alone Shake Shack restaurant.