Shake Shack is a modern day “roadside” burger stand, serving up delicious burgers, chicken, hot dogs, shakes, frozen custard, beer, wine and more. Our second Maryland Shack is in the heart of MGM National Harbor. That Shack’s spinning up the MGM National Harbor-exclusive Pie Oh My frozen custard concrete: vanilla custard and slice of Livin’ The Pie Life seasonal pie. Even sweeter? Five percent of sales from the Pie Oh My concrete support Moveable Feast.