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Interior of the underground Basilica of Saint Peter in Lourdes, with a central nave, an altar, and faithful people sitting on benches. The reverse indicates the dimensions (317 m, 200 m long, 80 m wide, 40 m high) and a capacity for 20,000 people, with the names of the architects P. Vago and Le Donné. French postmark of 1965 canceled in Lourdes.