I have never been to Italy or the Middle East, but I hear that many churches lay claim to possessing parts or all of the bodily remains of John the Baptist, St. James, or the other Apostles: their arms, their fingers, whatever. But, there is no church anywhere that claimes to possess the smallest part of Mary’s mortal body. That’s because Christians have always believed that she was taken bodily up to heaven.
God punished Adam and Eve, saying, “By the sweat of your face shall you get bread to eat, until you return to the ground from which you were taken. For you are dirt, and to dirt you shall return.” The corruption of the grave is our punishment for sin, but since Mary was sinless, she did not undergo corruption.
We needn’t worry about just where Mary’s body continues in existence. There is no need for a place. She has a spiritual body. That might sound like an oxymoron, but St. Paul pointed out that there are such things. In First Corinthians, 15:44 he said, “It is sown a natural body; it is raised a spiritual body. If there is a natural body, there is also a spiritual one.”