The Nordertor is an old town gate in Flensburg, Germany, which was built around 1595. Today the landmark is used as a symbol for Flensburg.
Wikipedia https://en.wikipedia.org/wiki/Nordertor
Address 163 Norderstraße, Flensburg 24939, Germany
Coordinates 54°47'43.946" N 9°25'48.605" E