 The Philadelphia area has many establishments that serve cheesesteaks, including restaurants, taverns, delicatessens and pizza parlors.The originator of the thinly-sliced steak sandwich in the 1930s, initially without cheese, is Pat's King of Steaks, which faces its rival Geno's Steaks, founded in 1966, across the intersection of 9th Street and Passyunk Avenue in the Italian Market of South Philadelphia.McGillin's Olde Ale House, opened in 1860 on Drury Street in Center City, is the oldest continuously operated tavern in the city.