Electoral Palace
Trier, Germany
The Electoral Palace (Kurfürstliches Palais) in Trier, Germany, was the residence of the Archbishops and Electors of Trier from the 16th century until the late 18th century. It now houses various offices of the federal government and often hosts classical music concerts.
Palace data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).