The Basilica of Sacré Coeur de Montmartre (Sacred Heart of Montmartre), says Wikipedia, is a Roman Catholic church and minor basilica in Paris dedicated to the Sacred Heart of Jesus. It was formally approved as a national historic monument by the National Commission of Patrimony and Architecture on December 8, 2022.  Sacré-Cœur Basilica is located at the summit of the butte of Montmartre. From its dome two hundred meters above the Seine, the basilica overlooks Paris and its suburbs and is the second most popular tourist destination in the capital after the Eiffel Tower.  (This hardly qualifies it as “minor”.)  Card was mailed in 2024, with postmark and a stamp that looks like a postage meter label with a QR Code.  Grade: 1