There's always something going on in the large square known as Roncalliplatz. Special events such as games, music and theatre take place one after the other here in summer. Skaters, street artists, rollerbladers and lots of tourists gather together here with people sitting on the edge of the rectangular fountain to watch. In wintertime there's also the attraction of the Christmas market der Weihnachtsmarkt. Like the Domplatte, die Domplatte, the square is adjacent to the increasing car traffic and all the noise and exhaust fumes come with it. Roncalliplatz is surrounded by the renowned Dom Hotel, the cathedral workmen's hut, the Museum of Roman and Germanic History dem Römisch-Germanischen-Museum and the Diocesan Museum Er zbischöfliches Diözesan-Museum. The Portuguese monolith in granite outside the Museum of Roman and Germanic History, the Columne pro Caelo, was built by Hienz Mack.