The viewing gallery in the Spacecraft Assembly Facility (SAF for short).
SAF is a giant clean room, clean enough to perform surgery in.
In the far corner of the room is the MSL cruise stage. To the left of it is the rover chassis.
All these photos were taken through these one inch thick plexiglass windows. Given the reflections, nose and hand prints, I'm very pleasantly surprised these photos came out as clear as they are.