Bates escapes Iris and Caitlin by transforming himself into a little girl in episode 1x19 "Who Is Harrison Wells?".
Barry walks across the street into a park and sees himself confronting Savitar who is holding Iris hostage in episode 3x09 "The Present". Barry and Cisco vibe into the future to review the events Barry witnessed in episode 3x10 "Borrowing Problems from the Future". Cisco vibes Wally to the future to witness events for himself in episode 3x15 "The Wrath of Savitar".
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 1x02 "Ernest Cobb".
Ezra watches Patrick buying flowers for Maddie and decides to approach him in episode 1x06 "The Maddie Code".