Italian architectural drawings: Research brings new discoveries Unknown artist, Unknown location (Rome?): project for the interior of a church, transversal (left) and longitudinal (right) elevation. Pen and brown ink, construction lines pre-scored with stylus, brown wash, compass, straightedge and freehand. Photo: Cecilia Heisser / Nationalmuseum. STOCKHOLM .- A collection of Italian architectural drawings held by Nationalmuseum was the subject of a recently completed research project. Anna Bortolozzi, associate professor of art history at Stockholm University, made a detailed study of the collection, which was once owned by the architect Carl Johan Cronstedt. By studying the drawings as material objects, using information beyond the purely visual, she made several new attributions and concluded that the collection belonged to Carlo Maderno, the most prominent Roman architect of the early baroque period.