InterContinental Athenee Palace Bucharest
Bucharest, Romania
The InterContinental Athénée Palace Bucharest is a historic luxury hotel in Bucharest, Romania, originally opened in 1914. It was arguably Europe's most notorious den of spies in the years leading up to World War II, and only slightly less so during the Cold War.
Hotel data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).