Colmar is a city in Alsace, France. It was the last town in France to be liberated during World War II, on February 2, 1945.
Alsace has changed nationalities many times in the course of history between France and Germany. Colmar has been French for most of its modern history, however its population used to be predominantly German. It was annexed to France after Germany lost WWI and during WWII Hitler reclaimed it. It is quite shocking to see photographs from the time with Nazi flags hanging through the streets.