Kaesong was the capital city of the Kingdom of Koryo. The city's gates, palaces, tombs and monuments, walls, schools, tower for looking at the stars and other buildings all together make up the World Heritage Site because they show the philosophy, culture, politics and spiritual beliefs of the Koryo people. The city's layout shows a mixture of Buddhism, Taoism and Confucianism. It especially shows the change from Buddhism to neo-Confucianism that happened during the Koryo Dynasty.