Fr John Zuhlsdorf blogs : Some time ago, I wrote a series of reflections on the Seven Sorrows of the Blessed Virgin. I invite you to have a look. Our Lady of Sorrows Project
Here are links to the individual posts
1st Sorrow – The Prophecy of Simeon
2nd Sorrow – The Flight into Egypt
3rd Sorrow – The loss of the Child Jesus in Jerusalem
4th Sorrow – Mary meets Jesus on the way to Calvary
5th Sorrow – The Crucifixion of Jesus
6th Sorrow – The Piercing of the Side of Jesus, and His Deposition
7th Sorrow – The Burial of Jesus
At the famous Basilica in Rome, Santo Stefano Rotondo we find this well-known image: