《史记·十二本纪·孝武本纪》
有的方士说 黄帝时建造五城十二楼，目的就是在执期等候仙人，称为 迎年 。
方士有言 黄帝时为五城十二楼，以候神人于执期，命曰迎年 。
Some sorcerers said that Emperor Huangdi built five cities and twelve towers during his reign, seeking to meet with immortals.