Stargate SG-1
Stanton Park
Sam meets with Agent Barrett in a D.C. park and learns about N.I.D. operations in episode 6x14 “Smoke & Mirrors”.
Source: Stargate SG-1 Locations
Hospital
Kinsey is being treated for his gunshot wound when Agent Devlin attempts to assassinate him using the guise of Major Davis in episode 6x14 “Smoke & Mirrors”.
Imaginary Hospital
Teal'c is treated for his injuries during his firefighter vision in episode 6x19 “The Changeling”.
Source: Stargate SG-1 Locations