Star City Data Center
Team Arrow and A.R.G.U.S. must defend the data center from Hive attack while Felicity and her father shut down the missiles in episode 4x21 “Monument Point”.
Palmer Technologies (loading dock)
Felicity and her father escape Palmer Tech with Lance's help in episode 4x21 “Monument Point”.
Air Filtration (interior)
Thea tries to convince Lonnie Machin not to blow up the air filtration system in the dome in episode 4x21 “Monument Point”.
Russian Fight Club
Oliver tracks Ragman to the gun exchange between Church and Janet Carroll in episode 5x02 “The Recruits”.
Felicity and Curtis track Black Siren's target to the stadium and Oliver is unsuccessful at getting the concert shut down in episode 6x07 “Thanksgiving”.