The River of Life series all have water flowing from the Temple or God’s Throne. The drawings with the Temples refer to Ezekiel’s Temple, as mentioned in Ezekiel, Chapter 47. Some depict a City on a Hill, which are loose interpretations of Ezekiel’s Temple. The drawings showing a pyramid atop the hill representing the New Jerusalem where the river flows from God’s Throne.
There was only one drawing of Golgotha, which I drew during the River of Life series:
The Crystal Mounts evolved into the Twilight Series