Superhero's lair below the Wayne Manor

• It lies beneath Wayne Manor
• Bruce Wayne's secret headquarters
• Hideout for masked men
• Part of Wayne Manor
• Subterranean hideout in comics
• Lower part of Wayne Manor
• It's under Wayne Manor
• Grotto under Wayne Manor, and an apt title for this puzzle

Wikipedia Word definitions in Wikipedia
The Batcave is Batman's secret hideout. Batcave or Bat Cave may also refer to: Batcave (club) , a Gothic rock nightclub Bat Cave, North Carolina Bat Cave and Cascade Caverns State Nature Preserves , a nature preserve in Kentucky dedicated to protecting ...