The Potsdam Conference was held in Cecilienhof Palace, the last palace built by the Hohenzollerns.

An excerpt from the article 24 facts about Potsdam

This palace was built for the heir to the throne, William of Hohenzollern, and his wife Cecilia, princess of Mecklenburg and Schwerin. It was modeled on English Gothic manors from Tudor times.

It belongs to the group of palaces and park complexes in Potsdam and Berlin inscribed on the UNESCO World Heritage List in 1990.