Later, mausolea became particularly popular in Europe and its colonies during the early modern and modern periods. A single mausoleum may be permanently sealed. A mausoleum encloses a burial chamber either wholly above ground or within a burial vault below the superstructure. This contains the body or bodies, probably within sarcophagi or interment niches. Modern mausolea may also act as columbaria (a type of mausoleum for cremated remains) with additional cinerary urn niches. Mausolea may be located in a cemetery, a churchyard or on private land.