So, let me get this straight...
The Justice League of America, an organization dedicated to upholding virtue and law, decency and freedom, justice and honour... kept the bodies of its defeated foes on display in some macabre museum. In the Hall of Justice.
Wow.
That's...
That's pretty frakking twisted, right there. Of course, none of them seemed to have a problem with Flash time-freezing that one kid and leaving him as a living statue, so I guess this makes senses.