Open Monument Day in Germany
Open Monument Day in Germany is held on September 8. Held on the second Sunday in September. This event in the first decade of the month September is annual. 
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The Heritage Day - in Berlin called "Day of the open Monument" - takes place every year in September and is a Europe-wide event.
Similar holidays and events, festivals and interesting facts
National Coffee Day in Germany on September 7 (Celebrated on the first Saturday in September);
Ganesha Festival on September 7
Mainz Science Market on September 7
Allgäu cattle drive on September 8
Nativity of the Virgin Mary on September 8
Discovery Day in Hanover on September 8
Intercultural Festival in Mainz on September 8
Citadel Festival in Mainz on September 8
Ecological and Social Market Economy Day in Germany on September 12
Rheingau Literature Festival on September 12 (The ten-day event begins the second Thursday in September);
Feelings of Happiness Festival at the Hockenheimring on September 12