An official relay station in the corridor
At Xuanquan, an excavated Han-period posthouse preserves the remains of official travel, lodging and administration along the Hexi route.
The posthouse sits at Tianjianjing in Mogao Town, Dunhuang City. A 2025 provincial article places it about sixty-four kilometres west of Dunhuang's built-up area and about sixty kilometres east of Guazhou county seat. It served mail and travelling guests for more than three centuries and yielded large slip archives.
At Xuanquan, an excavated Han-period posthouse preserves the remains of official travel, lodging and administration along the Hexi route.