Since ancient times, in some cultures efforts have been made to slow, or largely stop the body's decay processes before burial, as in mummification or embalming. This process may be done before, during or after a funeral ceremony. Many cultures have locations in which graves are usually grouped together in a plot of land, called a "cemetery" or "graveyard". Burials can be arranged by a funeral home, mortuary, undertaker or by a religious body such as a church or the community's burial society, a charitable or voluntary body charged with these duties. The preserved or unpreserved body may then be interred in a grave, crypt, sepulchre, or ossuary, a mound or barrow, or a monumental surface structure such as a mausoleum (exemplified by the Taj Mahal) or a pyramid (as exemplified by the Great Pyramid of Giza). In some cases, a part of the remains may be preserved; in early ancient Greece, remains were cremated, but the bones preserved and interred.