The original location celebrates its centennial this year, and as the neighborhoods surrounding it have changed, Margie’s has remained a constant, a beacon for teenagers who cluster in groups and for older couples on dates, everyone outside waiting for a booth. Inside is a diner/candy shop/ice cream parlor, its walls covered in memorabilia, much of it dating to that night in 1965 when the Beatles stopped by after their concert in Comiskey Park. Greek immigrant George Poulos named Margie’s for his wife, who ran it until her death in 1995. Margie’s homemade ice cream is just fine, but the magic comes in the way the sundaes come together — order the hot fudge version and you’ll get a gravy boat of rich chocolate plus whipped cream that’s dispensed showily from a gun. $5.25; 1960 N. Western Ave., Logan Square