An altar is a sacred space or structure used in religious ceremonies. A SANCTUARY is a place of refuge and protection, often associated with a church or temple. A CHANTRY is a chapel or room dedicated to the worship of a particular saint or deity. A reredos is an ornamental screen or wall behind an altar. A SHRINE is a holy or sacred place dedicated to a specific deity, ancestor, hero, martyr, saint, or similar figure. An APSE is a semicircular recess in a church, typically at the eastern end. An ara is an altar or other structure used for sacrifice or worship in ancient Rome. An AISLE is a long passage or hallway, typically one in a church, leading to the altar. A BOY is a young male attendant at a religious ceremony.