The term 'Places in an Altar' can be summarized by the crossword solution APSE, which is a four-letter word. An APSE is a semicircular recess in the wall of a church, typically at the end of the chancel, which contains the altar. It is often used to house the choir and the sanctuary. Apses are common features in churches and other religious buildings, and they are often decorated with mosaics or frescoes.