Bates escapes Iris and Caitlin by transforming himself into a little girl in episode #119 "Who Is Harrison Wells?".
Barry walks across the street into a park and sees himself confronting Savitar who is holding Iris hostage in episode #309 "The Present".
Source: fakedestielfan — Twitter
Underground public restrooms where the Fringe team follows Walter's tracer only to discover it has been removed in episode #210 "Grey Matters".
From episode #203 "Fracture".
Rebecca and Emerson track Ernest Cobb to two buildings around Victory Square and this is where he is targeting his victims in episode #102 "Ernest Cobb".