The "Palaces and Parks of Potsdam and Berlin" is a UNESCO World Heritage site that showcases the architectural and landscape design of the 18th and 19th centuries. Key attractions include the stunning Sanssouci Palace, the summer residence of Frederick the Great, and the expansive Sanssouci Park, which features beautiful gardens and fountains. In addition to Potsdam, the site encompasses several palaces in Berlin, such as the Charlottenburg Palace. These locations reflect the cultural and historical significance of the Prussian monarchy and their influence on European art and architecture, making them important destinations for visitors.