The event is coordinated by the German Foundation for Monument Protection. This year’s theme is: “NetzWERKE: Monuments & Infrastructure.” 

As early as 1883, a wooden observation tower was erected on the Schläferskopf, but it was dismantled in 1900 due to dilapidation. The current tower, which stands approximately 30 meters tall and is built of Taunus quartzite and basalt lava, is its successor. It was constructed in 1905–1906 at the initiative of the Wiesbaden Beautification Association, which was very active at the time. Based on plans by architect Euler, a picturesque round tower was erected; with its small watchtower atop the observation deck, it is modeled after a medieval watchtower or keep. The tower—together with the adjacent “Kaisersaal”—is a key component in the systematic development of Wiesbaden’s spa landscape, a project driven primarily by the city’s own citizens. Its design, naming, and inscription also serve as political statements with broader regional significance. 

Of particular architectural historical significance is the staircase with two counter-rotating spirals, which lead to separate entrances or exits at the top and bottom and allow for separate ascents or descents. 

Further information about Open Monument Day is available on the website of the German Foundation for Monument Protection at www.tag-des-offenen-denkmals.de/programm.