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Dunhuang · Day Trip
The western end of the Great Wall - the fortress of the last pass, 370 km east on the rail line, with the hanging Great Wall above it.
Morning train east to the fortress town (about 4 hours); afternoon at the mighty Jiayuguan fortress - the gate of the western frontier.
Morning at the overhanging Great Wall climbing the black ridge, then the afternoon train back to Dunhuang.