The three world heritages in Luoyang refer to Longmen Grottoes, the Grand Canal and the Silk Road, and the six are Longmen Grottoes, Luoyang Hanjiacang Site, Huiluocang Site, Luoyang City Site in Han and Wei Dynasties, Dingdingmen Site in Luoyang City in Sui and Tang Dynasties, and Han Hanguguan Site in Xin 'an.
Of course, the west gate of the botanical garden faces west. It's the main entrance of the botanical garden, on Wangcheng Avenue. See the guide map of Sui and Tang Botanical Gardens.