In ancient times, getting from Shaanxi into Sichuan meant taking plank roads built on the cliffs.
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The old roads into 蜀, today's Sichuan, crossed the mountains on 栈道: holes were cut into the cliff, beams pushed in and planks laid on top. Scenic areas now build glass-floored ones, a 玻璃栈道 or 'glass skywalk'.
