thirteenth day of a month

the Thirteen Confucian Classics, namely: Book of Songs [[詩經|诗经<Shījīng>]], Book of History [[尚書|尚书<Shàngshū>]], Rites of Zhou [[周禮|周礼<Zhōulǐ>]], Rites and Ceremonies [[儀禮|仪礼<Yílǐ>]], Classic of Rites [[禮記|礼记<Lǐjì>]], Book of Changes [[易經|易经<Yìjīng>]], Mr Zuo's Annals [[左傳|左传<ZuǒZhuàn>]], Mr Gongyang's Annals [[公羊傳|公羊传<GōngyángZhuàn>]], Mr Guliang's Annals [[穀梁傳|谷梁传<GǔliángZhuàn>]], The Analects [[論語|论语<Lúnyǔ>]], Erya [[爾雅|尔雅<Ěryǎ>]], Classic of Filial Piety [[孝經|孝经<Xiàojīng>]], Mencius [[孟子<Mèngzǐ>]]

half-witted

the Ming tombs (mausoleum park of the Ming emperors in Changping district of Beijing)

thirteen peaks of Meri snow mountains in Diqing Tibetan autonomous prefecture [[迪慶藏族自治州|迪庆藏族自治州<DíqìngZàngzúzìzhìzhōu>]], Yunnan