A raised place on which offerings to a god are made

One word substitute is Altar.

Mound: a rounded mass projecting above a surface.
Chapel: a small building or room used for Christian worship in a school, prison, hospital, or large private house.
Altar: a table or flat-topped block used as the focus for a religious ritual, especially for making sacrifices or offerings to a deity.
Archives: a collection of historical documents or records providing information about a place, institution, or group of people.