What the Batcave is
Bob Kane and Bill Finger first referenced the Batcave as ‘Bat’s Cave’ in Batman #12 (August 1942). The canonical ‘Batcave’ designation and sustained appearance comes in Detective Comics #83 (January 1944). The cavern beneath Wayne Manor serves as Batman’s operational base across decades.
Collector context
Detective Comics #83 trades in the four-figure range at CGC 9.0 and above. Batman #12 (the precursor ‘Bat’s Cave’ reference) trades higher because of its earlier Golden Age status.