An ancient sanctuary is a place of worship that has been around for centuries. The term 'ancient sanctuary' can refer to a variety of religious sites, including temples, churches, and shrines. In this particular crossword puzzle, the answer to the clue 'ARK' is three letters long and refers to Noah's ARK, which is an iconic symbol of faith in the Bible. Noah's ARK was a large vessel built by Noah at God's command to save his family and two of every kind of animal from the great flood.