The Tag des offenen Denkmals (Day of Open Monuments) is an annual event all over Germany.

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.

Organised by the Deutsche Stiftung Denkmalschutz, it is Germany's contribution to the European Heritage Days held throughout Europe.

The first Tag des offenen Denkmals was held in 1993, modeled after the Dutch Open Monumentendagen.

It is supported by several thousand local initiatives and partners – from volunteers to the Landesdenkmalamt (Monument office).

[10] Every year, the Deutsche Stiftung Denkmalschutz chooses a motto to focus on a specific aspect of heritage preservation:[11] From 2021, the Deutscher Orgeltag (German Organ Day) will take place at the same time as the Tag des offenen Denkmals (Open Monument Day).