People posting about Chengdu trips on WeChat love to caption with 'nine heavens opened to reveal a Chengdu.'
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From 李白 Li Bai 《上皇西巡南京歌》 (one of a set written when Xuanzong fled to Chengdu, then called 南京): 九天开出一成都，万户千门入画图 — 'the nine heavens opened to produce a Chengdu; ten thousand gates and doors form a painting.' Chengdu tourism has adopted the line as an unofficial motto.
usage
都 here is dū (capital/city), not dōu. 九天 = 'the nine heavens,' the highest realm in classical cosmology — implying Chengdu is heaven-born. Usually quoted with the next line 万户千门入画图.
