The JU-52 airplane was one of the most successful planes before the Second World War. It is often referred to as "Tante Ju" or "Aunt Ju".
It was brought into duty in 1932 and was built until the early 50s. German Airline Lufthansa selected the JU-52 as its main plane in the early 30s. As a speciality, this plane's exterior was made from corrugated iron.
This specific foto was taken in Deutsches Technikmuseum in Berlin, a place, you should always consider visiting when being in that city.