There is a large rock on the Mount of Olives, close by the Garden of Gethsemene. Biblical scholars and historians believe that is the rock at which Jesus prayed the night He was arrested.
Today, the Church of All Nations is built over that rock. This image depicts the interior view of the church, the rock and the painting above it.
Click on the image for a better view.
Image online, courtesy the Vatican web site - ChristusRex.org.