The Batcave is a fictional subterranean comic books published by DC Comics.
It is the secret headquarters of the superhero Batman,
whose secret identity is Bruce Wayne,
consisting of underground caves beneath his personal residence
The cave was discovered and used long before by Bruce Wayne's ancestors as a storehouse as well as a means of transporting escaped slaves during the Civil War era.
The 18th century frontier hero Tomahawk once discovered a gargantuan bat (owned by Morgaine le Fey of Arthurian legend) inside what can be assumed will become the Batcave
Wayne himself rediscovered the caves as a boy when he fell through a dilapidated well on his estate, but he did not consider the cave as a potential base of operations until he rediscovered it yet again when he returned to Gotham to become Batman.
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From @ogunlaja