Midway City Orchestra
Leonard Snart shoots up the concert hall with his cold ray in episode 1x04 “Going Rogue”.
Cisco goes on a date with Kendra Saunders but has to bail when he has a vibe about a bird-person in episode 2x07 “Gorilla Warfare”.
Central City Museum
Barry and Ralph head to the museum to stop Mina Chayton from stealing back the necklace in episode 4x06 “When Harry Met Harry…”.
Midway Auction House (interior)
Barry does a poor job as Ralph's assistant as he tries to investigate the disappearance of Sue Dearbon in episode 6x06 “License to Elongate”.