Hwaseong Fortress is located in the city of Suwon, in the northwest of the country. This fortress was built at the end of the 18th century by the order of King Jeongjo, who wanted to place the remains of his father, Prince Sado, who was executed while locked alive in a coffin with rice because he did not want to obey the order to kill himself. King Jeongjo wanted to move the capital from Seoul to Suwon, and he encouraged people to move by exempting them from taxes for ten years. The fortress is a fantastic example of Asian architecture of its time, the 4-6 meter high walls have four gates and watchtowers. Inside the fortress's walls is a fire tower with smoke signals through five chimneys, pavilions, and other buildings. The Hwaseong Fortress was included in the UNESCO list of World Heritage Sites in 1997.