The Old City of Bern, Switzerland, is a remarkable medieval city center that has retained its historical character through centuries. Nestled on a hill and surrounded by the Aare river, its layout has remained largely unchanged since the 12th to 15th centuries. Recognized as a UNESCO World Heritage Site, the Old City boasts Switzerland's tallest cathedral, numerous historic buildings, and a collection of Renaissance fountains, all contributing to its unique charm and cultural significance.