tag-des-offenen-denkmals.de

Tag des offenen Denkmals is a nationwide open-day event in Germany, held on the second Sunday of September, at which monuments and historic buildings open to visitors. The event is coordinated by the Deutsche Stiftung Denkmalschutz, which sets the annual motto, provides a programme and advertising materials, and runs national press and public relations work. The name is a registered trademark of the foundation.

Local events are organised by monument owners, associations, initiatives and professional monument conservators, and the foundation supports them with a service offering. The foundation itself is a private initiative for monument conservation that funds about 600 projects a year, mainly through donations from more than 200,000 supporters. It has been coordinating the open day nationally since 1993 and describes it as Germany's contribution to the European Heritage Days.

The 2026 edition took place on 13 September with more than 7,000 monuments and around 11,000 events, according to the website. The site also offers a mobile app for iOS and Android with event locations and routes, and a annual photo competition, which in 2026 drew 450 entries.

Product: Nationwide open-day event for historic monuments, with programme, mobile app, photo competition and promotional materials.