When Billy was in Los Angeles displaying his Batmobile (which he built) for the Discovery Channel, he went to the Bat Cave entrance, which happens to be named Bronson Cave, and he cruised by Bronson Avenue. Feb 2018

Bronson Avenue goes up into the Hollywood Hills.. (where the Hollywood Sign is) .. It merges with Bronson Hill Drive, and Canyon Drive, which dead ends at Bronson Park, which is where Bronson Caves is located.. The Hollywood Sign is the back side of the Bat Cave/Bronson Caves.