In BDSM (bondage/discipline, Dominance/submission, sadism/masochism) play, a dungeon is any space set aside for scene activities. It may or may not be underground and may or may not resemble a stereotypical dungeon from a Robin Hood film. Private dungeons are often fabricated in residential basements or spare rooms. BDSM organizations sometimes secure space for their members to play; old warehouses and factory spaces are popular for this. Some dungeons are open to the public on a membership basis or as a nightclub. These are called "public dungeons" even if they are only open to members.