Tenet filmed at Kumu Art Museum, Tallinn. Neil gets a tour of the Freeport here, and its lobby is this Tallinn art museum. On screen it's Oslo Freeport.
Probable Named in published production coverage; the coordinate is the place itself, checked against a gazetteer.
Planning the trip? everything filmed in Tallinn is on one page
Venture keeps every scene location on one map, sorted by how far you'd have to walk. Open it in Tallinn and it tells you what was shot around you, how to get there, and whether you can actually go in.
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