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Ratu Boko is an 8th-century hilltop archaeological complex offering sweeping views over the Prambanan plain and the distant silhouette of Mount Merapi. The ruins include massive stone gateways, bathing pools, meditation caves, and ceremonial platforms, their purpose still debated by historians.
Built during the late 8th century, probably under the Sailendra and later the Sanjaya dynasty, Ratu Boko may have served as a fortified palace or a Buddhist monastery. Inscriptions found on-site reference both Buddhist and Hindu elements, suggesting it served multiple religious functions over time.