Open Monument Day in Germany
Open Monument Day in Germany is held on September 13. Held on the second Sunday in September. This event in the second 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
Ecological and Social Market Economy Day in Germany on September 12
Freiberg Night Shift on September 12
Lollapalooza Berlin on September 12
Maritime Week Bremen on September 12
Kempen Autumn Fair on September 12
Viersen-Süchteln Autumn Fair on September 12
World Headache Day on September 12 (A Day of Awareness and Support);
Feast of the Exaltation of the Holy Cross on September 13
Discovery Day in Hanover on September 13
Mainz Science Market on September 13
Intercultural Festival in Mainz on September 13
Citadel Festival in Mainz on September 13
Ganesha Festival on September 15