A crematorium or crematory is a venue for the cremation of the dead. Modern crematoria contain at least one cremator (also known as a crematory, retort or cremation chamber), a purpose-built furnace. In some countries a crematorium can also be a venue for open-air cremation. In many countries, crematoria contain facilities for funeral ceremonies, such as a chapel. Some crematoria also incorporate a columbarium, a place for interring cremation ashes.