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Marienfeld is a large (2.6 km² / 640 acres) grassy field on the reclaimed site of a former open-pit lignite mine about south-west of Cologne Cathedral in the city of Cologne, Germany, straddling the towns of Frechen and Kerpen. The mine area was named Marienfeld ( German: Mary's Field) and landscaped in order to serve as the site of the Catholic Church's 20th World Youth Day in 2005.