RFPYYM4B–Massive stones and earthen ramparts form the north wall of the Ho Citadel, Thanh Hoa Province, Vietnam. The citadel became a UNESCO World Heritage Sit
RFPYYM53–Ho Citadel, Thanh Hoa Province, Vietnam - May 9, 2014. Tour guide and monks at the south gate of the citadel, which became a UNESCO World Heritage Sit
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