Discussion: The Altar

Does you church have an altar (or more than one altar) in the sanctuary? Does each service end with an altar call style invitation? What are we being invited to do at the altar if/when we get there? I would like to put aside personal feelings, experiences and what any particular local church does or doesn’t do and look into the Bible as we analyze the purpose of the altar. Ultimately I would like us to answer this question: what is the place of the altar in the New Testament church?