House of Gucci filmed at Santa Maria church, Portico. The wedding of the two leads is filmed in this church in Portico.
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 Portico and it tells you what was shot around you, how to get there, and whether you can actually go in.
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