The Godfather Part III filmed at Villa Farnese, Caprarola. This pentagonal villa in Caprarola houses the archbishop's office, where frescoes show the whole known world from the 1500s. On screen it's Archbishop's office.
Probable Named in published production coverage; the coordinate is the place itself, checked against a gazetteer.
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Venture keeps every scene location on one map, sorted by how far you'd have to walk. Open it in Caprarola and it tells you what was shot around you, how to get there, and whether you can actually go in.
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