Okay, this may be a strange one, but Oolong Island – the island state populated entirely by mad scientists that first appeared in 52
back in 2006 (Yes, nine years ago, and yes, you're getting old) – was a concept that celebrated the endless inventiveness of DCU science in all its goofy glory, as only befits an island where one of the inhabitants was a genocidal giant talking egg.
Oolong's various scientist inhabitants were reminders of everything that had been accomplished in the DCU, from lifelike androids to time travel to… well, what Doctor Cyclops, Dr. Rigoro Mortis and others brought to the party was somewhat obscure admittedly, but that was almost the point. It was a concept that reminded readers that anything was possible, which was as exciting as it was fun. Compare that to the mysterious, vague technology of the New 52, which seems limited in scope and invention for the most part, and it's clear that the current state of DC science needs a giant leap forwards.
At least there were scary science experiments on Cadmus Island in Futures End.