Rome - Walls between St Peter and Castel Sant'Angelo (Merian 1652), Matthäus Merian, 1652

Matthäus merian, plan of the city of rome 1652, detail: walls and buildings between st. Peter's and the castel sant'angelo; at the top of the obelisk the escape passage passetto, to the north in the parallel wall the porta angelica. Date: 1652.