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Astronomical Instruments at Beijing Wall Tower - 19th Century
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Western End of Gobi Desert - Entering Han Great Wall - Yumen Kuang (Gate of Gate Door) - Part of Silk Road
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South Side Wall's Beam Holes and Wooden Mats on Dividing Wall - Pit No.1
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Western End of Gobi Desert - Han Great Wall - Layers of Straws - Close-up View - Part of Silk Road
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South Side Wall and Wooden Mats on the Area Dividing Walls - Pit No.1
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