Francis applauded, then gave his blessing after Rome's mayor unveiled the simple white stone plaque marking "Giovanni Paul II Square" in a section of the vast piazza, which often hosts free rock concerts and political and labor rallies.

NPR: Francis Honors John Paul II Before Installation

As the rock that tied them all together, it is fitting that his plaque sits upon on a large white rose quartz boulder.

BBC: An American pilgrimage to Concord