"The Tag des offenen Denkmals (Day of Open Monuments) is an annual event all over Germany. The day of action has been coordinated by the Deutsche ...
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Stiftung Denkmalschutz since 1993. Historic monuments are open to the public free of charge. It takes place on the second Sunday in September and attracts several million visitors each year [de]. The largest cultural event in Germany is the contribution of the country to the European Heritage Days." - (en.wikipedia.org 12.10.2023)
