Castles & palaces
Palazzo dei Papi di Viterbo
Building in San Martino al Cimino, Italy
Wikipedia names Palazzo dei Papi di Viterbo as where 1 film or series was filmed; its page links to the sentence that says so. Wikidata records no shoot here yet.

Filmed here, per Wikipedia
Wikipedia says these were filmed in Palazzo dei Papi di Viterbo. Each title’s page links to the sentence that says so.
Filming locations nearby
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Towns & cities Viterbo
Italy · under 1 km
Italian commune (comune) in Lazio
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Landscapes & nature
Villa Lante
Italy · 4 km east
Renaissance villa in Bagnaia, Italy
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Landscapes & nature
Gardens of Bomarzo
Italy · 15 km north-east
Manieristic monumental complex located in northern Lazio, Italy
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Castles & palaces
Villa Farnese
Italy · 15 km south-east
Mansion in the town of Caprarola, Italy
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Towns & cities
Caprarola
Italy · 15 km south-east
Italian comune
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Towns & cities Vignanello
Italy · 15 km east
Italian comune