Maerten van Heemskerck, The Piers of the Cross Vault of New St. Peter’s Basilica and the R
Maerten van Heemskerck, The Piers of the Cross Vault of New St. Peter’s Basilica and the Rest of the Northern Transept of the Old Basilica. Roman Sketchbook I (1532-1536). Pen and ink on paper. Staatliche Museen, Berlin. -- source link
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