Photo shows the more-than-2200-year-old Yumbulagang located in Shannan, southwest China's Tibet. Yumbulagang was built in the second century BC and was the first palace established in Tibet.

Photo shows the more-than-2200-year-old Yumbulagang located in Shannan, southwest China's Tibet. Yumbulagang was built in the second century BC and was the first palace established in Tibet.

Photo shows the more-than-2200-year-old Yumbulagang located in Shannan, southwest China's Tibet. Yumbulagang was built in the second century BC and was the first palace established in Tibet.

Photo shows the more-than-2200-year-old Yumbulagang located in Shannan, southwest China's Tibet. Yumbulagang was built in the second century BC and was the first palace established in Tibet.

Photo shows the more-than-2200-year-old Yumbulagang located in Shannan, southwest China's Tibet. Yumbulagang was built in the second century BC and was the first palace established in Tibet.

Photo shows the more-than-2200-year-old Yumbulagang located in Shannan, southwest China's Tibet. Yumbulagang was built in the second century BC and was the first palace established in Tibet.