Leonard Snart sees the black hole suck up buildings in episode 1x23 "Fast Enough".
Barry and the team stake out of the gallery where the Turtle plans on stealing a painting in episode 2x10 "Potential Energy".
The Dodger forces a guard to steal a priceless gem for him in episode 1x15 "Dodger".
Oliver gives testimony about what occurred on the island and then has a run-in with Laurel at the courthouse in episode 1x02 "Honor Thy Father". Tommy intercepts Laurel as she is leaving work in episode 1x03 "Lone Gunmen". Oliver has a hearing here when he is accused of being the Vigilante in episode 1x05 "Damaged". From episode 1x12 "Vertigo". Laurel prosecutes a case here in episode 3x10 "Left Behind". Darhk is put on trial in episode 4x16 "Broken Hearts".
Oliver is perp-walked up the steps into the police department while being swarmed by press in episode 1x05 "Damaged".
Diggle and Carly talk about their relationship while strolling through a park in episode 1x15 "Dodger".
The Dodger attempts to sell his stolen gem to Cass Derenick but the fence tries to rip him off in episode 1x15 "Dodger".
Liv meets Major when he is released on bail only for him to be arrested by Clive for another crime in episode 2x18 "Dead Beat".
The outside of the metro station where the team stop Diane Burgess from exploding in episode #203 "Fracture".
Peter meets in a congressional meeting room, and then Fauxlivia, Walter, and Peter talk on the steps of the capitol building at the end of episode #301 "Olivia".
Walternate receives a phone call about Olivia's escape in episode #308 "Entrada".
Olivia goes undercover to stop the attack on the art show in episode #312 "Concentrate and Ask Again".
Max drives her motorcycle into the courtroom and drops off the witness in episode 1x09 "Red".
Backstrom meets with the civilian oversight committee and has a panic attack during his testimony in episode 1x04 "I Am a Bird Now".
Backstrom confronts Cassandra Lastrange after she talks to Charles Turner in episode 1x01 "Dragon Slayer". Gravely and ADA Kines convince a judge to give them a warrant on the steps to the courthouse in episode 1x10 "Love Is a Rose and You Better Not Pick It". Backstrom and Amy have a fight on the steps in episode 1x12 "Corkscrewed".
Karen is brought to court. Filmed in the heritage courtrooms. in episode 1x06 "Low Art".
Vice President Maccabee is sworn in on the steps of the capitol building in pilot episode "Pilot".
Lucy and Wyatt are arrested as Communist spies while walking up the capitol steps to investigate the McCarthy hearings in episode 1x16 "The Red Scare".