Sent during one of history's darkest chapters, this real-photo postcard of Kraków's magnificent Wawel Castle — the ancient seat of Polish kings, photographed by St. Mucha and captured here in a sweeping view from the Vistula riverbank — bears a 12-Heller Generalgouvernement stamp, the Nazi occupation authority's own postal issue, cancelled at Kraków (KR) in what appears to be February 1942, addressed to a Fräulein in Rehberg bei Krems in the Ostmark (Austria, renamed under Nazi annexation). The message, written in German, reads "Greetings from Kraków; greetings to all acquaintances" and is signed by "Fr. Funk." The Generalgouvernement was the Nazi civil administration of occupied Poland (1939–1945), and its distinctive eagle-and-swastika postal issues are among the most historically significant — and sobering — philatelic artifacts of the Second World War. The card itself depicts Zamek Krakowski (Wawel Castle) with its baroque cathedral towers, which the Nazis occupied as the seat of Governor-General Hans Frank. A powerful document of occupation-era correspondence.