Aerial view of an open-air mass in Vrijthof square during the 1962 Pilgrimage of the Relics (<i>Heiligdomsvaart</i>) in Maastricht, Netherlands. The 10 or 15-day religious festival is celebrated in Maastricht every seven years and dates back to the Middle Ages. Photo: Municipal Archives Maastricht (GAM 27594), part of RHCL collections.
Naseman
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