Palazzo di Spagna
Rome, Italy
The Palazzo di Spagna (Palace of Spain); also known as the Monaldeschi Palace, is a historic Italian Baroque-style palace in the Piazza di Spagna (Spanish Square) that was previously owned by the Monaldeschi family. It has housed the Embassy of Spain to the Holy See since 1647, and is owned by the Spanish state.
Palace data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).