Bruce Wayne discovered the cavern that would become the Batcave while he was proposing to Andrea Beaumont. While they were kissing after she said yes several bats flew out of the ground. Later Bruce explored the cave. When Bruce became Batman this became the place he housed everything he needed to fight crime. Entrances A stair case behind a grandfather clock in the manors library
A bookshelf in the manors library covered the entrance to a private elevator that goes down to the Batcave Batman's Private Museum A giant penny A tyrannosaurus rex statue Scareface puppetA giant Joker card Mister Freeze's freeze gun Mister Freeze's helmet Harley Quinn's mask Harley Quinn's costume Riddler's costume The Mad Hatter's costume The Penguin's costume Catwoman's costume Firefly's costume Killer Croc statue Roxy Rocket's rocket There is also a display of the Gray Ghost in the Batcave. Training Simulators The first training simulator in the Batcave was an obstacle course Batman and his partners had to get through without being hit by lasers. The second training simulator involved 3D holographic technology and robots called synthoids that looked like Batman's enemies. Secret Chambers Behind the costume case there was a secret room where Batman kept a piece of Kryptonite only to be used in the event that Superman became evil.