Robot Museum

The Robot Museum (ロボットはくぶつかん) is, as its name suggests, a facility introduced in Mega Man 7 that stores a number of robots. A robot museum appeared in more than one game, but it is unknown if they are the same museum or different locations.

Mega Man 7
After Mega Man defeats four Robot Masters, Dr. Light detects an attack to the robot museum and Mega Man investigates. Inside, he sees Dr. Wily stealing a copy of Guts Man from it (that he later modified in order to create Guts Man G) and he leaves Mash to deal with Mega Man.

Mega Man & Bass
The Opening Stage is a robot museum that King attacks to collect data from its robots in order to create his robot army.

Mega Man (Archie Comics)
After Dr. Wily was considered deceased in the aftermath of the Gamma incident, Mega Man, Roll, and Dr. Light repaired and restored the Robot Masters created by Dr. Wily and Ra Moon to give them a chance to find new purposes. However, some of the Robot Masters felt that they were too experimental or specialized to serve any real purpose while others did not want to be reprogrammed to become industrial Robot Masters, so they chose to be shut down instead. Roll tried to comfort a devastated Mega Man by suggesting that they could start a robot museum to preserve them, and after repairs to the lab were made, Megaman, Guts Man and Concrete Man worked on moving Quick Man and the other Robot Masters that chose to be deactivated there.

As of the latest issue, the Robot Master Museum will contain Metal Man, Quick Man, Crash Man, Heat Man, Needle Man, Magnet Man, Gemini Man and Top Man.

Other appearances
A robot museum appeared in the Rockman 7 and Rockman & Forte manga.

Trivia

 * In the area where you fight Mash, the two robots in the background are Ring Man and Skull Man, the two robot masters that have been canonically confirmed to be designed purely for fighting, which is ironic, as that is where you fight a boss.