In 1982, ICOMOS, the International Council on Monuments and Sites, pronounced 18 April as the day dedicated to monuments and heritage sites; a year later it was approved by the General Conference of UNESCO. This year, the Slovenian Theatre Institute – Theatre Museum joins the celebration of this day with the publication of a photograph showing the construction of the Ljubljana Drama. The building has been listed as a national cultural monument with characteristics of an architectural monument. It was built in 1911, as designed by the Viennese architect Alexander Graf, formerly a member of the renowned architectural studio Fellner & Helmer. The opening of the German Theatre, or the Emperor Franz Joseph Jubilee Theatre was on 4 October that same year. Since 6 February 1919, Slovene spoken performances have been staged in the building.