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St. Peter's, centering truss, tunnel vault, section (recto) blank (ver...
Public domain scan of an architecture diagram, plan, or drawing, free to use, no copyright restrictions - Picryl description.
St. Peter's, centering truss, tunnel vault, section (recto) blank (ve...
Drawn by Anonymous, French, 16th century Public domain scan of 16th-century drawing, free to use, no copyright restrictions image - Picryl description
A stone tunnel with two red doors and a dirt hill in the background. F...
The tunnel at the end of the tunnel / A tunnel with red doors and a red door public domain military photo.
St. Peter's, centering truss, tunnel vault, section (recto) blank (ver...
Public domain scan of an architecture diagram, plan, or drawing, free to use, no copyright restrictions - Picryl description.