The Talented Mr Ripley filmed at Ischia Ponte, Ischia. Ripley steps off the bus in this busy square below the Aragonese castle. On screen it's Mongibello.
Probable Named in published production coverage; the coordinate is the place itself, checked against a gazetteer.
Planning the trip? The Italy travel atlas covers money, language and getting aroundand everything filmed in Ischia is on one page
Venture keeps every scene location on one map, sorted by how far you'd have to walk. Open it in Ischia and it tells you what was shot around you, how to get there, and whether you can actually go in.
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