icehouse Restaurant in the Forbidden City doesn't need to make an appointment. Dining is done according to the business hours of icehouse Restaurant, and people need to queue up to get the number when there are many people. Icehouse Restaurant, located in the Palace Museum in Beijing, is the only restaurant in the Palace Museum in Beijing. Icehouse used to be a place to store ice for ancient emperors, but it was changed into a place to provide catering for tourists. Formerly known as the Palace icehouse, it was built in the Qianlong period of Qing Dynasty. It was used by the royal family in ancient times and was a semi-underground arch-coupon cave building. Every time after beginning of winter, Tongzi River will rinse the river for water purification, build a temporary dam with wooden piers to store water, and wait until it is frozen and firm after the winter solstice, and hire civilian workers to cut the ice cubes into one foot and five inches square, pull them into icehouse and put them in neat patterns, waiting for them to be opened in summer.