June Jubilee #20

The Landesflagge (civil flag) of Hamburg, Germany. The civil flag shows a white castle with three towers on red background, which is used as a civil flag as a state flag for most purposes. The oldest seal with the castle is thought to date from 1241. The first flag featuring the current form was in the mid-1500s, although this was most probably a red field, a white escutcheon and red castle. After about 1623, the escutcheon began to be omitted, leaving a red castle on white or a white castle on red. It was only in 1751 that the white castle on red was decreed as the flag of Hamburg. (via Wikipedia) Thank you Gunda!