From LEGO Batman Wiki
Located far below Wayne Manor, the Batcave is also be used as the HUB for the heroes in Lego Batman: The Video Game. It is very large and has many floors, and serves as aAlfred constantly roaming the batcave. It is Batman's secret headquarters and contains the Batcomputer, several vehicles and much technology. It has access to Wayne Manor, Arkham Asylum and the Batcave Trophy Room. Its location is known only by Batman, Robin and Alfred.