A capital that went back to grass
Xanadu was Kublai Khan's first capital and then the Yuan summer capital. The walls were abandoned in 1430 and inscribed in 2012.
The World Heritage page dates it as first capital from 1263 to 1273 and summer capital from 1274 to 1364, abandoned in 1430. The map point is the dossier coordinate on that page, not the railway station in Zhenglan.
Xanadu was Kublai Khan's first capital and then the Yuan summer capital. The walls were abandoned in 1430 and inscribed in 2012.