Following the last ice age, sand dunes were deposited in the Rhine Valley...the western edge of the city. The sand dunes in Mainz are today, a nature reserve with a very abstract landscape and rare steppe vegetation for the area.
According to legend - Mainz is the birthplace Pope Joan, the first and only female pope. She achieved this by disguising herself as a man & she served for two years.
"It is a press, certainly, but a press from which shall flow in inexhaustible streams...Through it, God will spread His Word. A spring of truth shall flow from it: like a new star it shall scatter the darkness of ignorance, and cause a light heretofore unknown to shine amongst men"
— Johannes Gutenberg