The Yuanmingyuan, or Garden of Perfect Brightness, began in 1707 when the Kangxi Emperor granted a garden northwest of Beijing to his son, the future Yongzheng Emperor. Yongzheng and the Qianlong Emperor greatly enlarged it into an imperial residence and governmental retreat. The broader estate eventually comprised Yuanmingyuan, Changchunyuan, and Qichunyuan, linked by lakes, streams, hills, gardens, halls, temples, libraries, theaters, workshops, and residential compounds. Qing rulers worked there for much of the year, making it a center of court ceremony, administration, collecting, and designed landscape.

Most architecture followed Chinese timber-building and garden traditions, with carefully composed views that evoked famous landscapes and literary themes. Qianlong also commissioned Jesuit artists and engineers, including Giuseppe Castiglione and Michel Benoist, to design the Xiyang Lou, or Western Mansions. Their masonry façades, fountains, hydraulic works, and formal gardens blended European Baroque sources with Qing court preferences. The estate held paintings, manuscripts, bronzes, ceramics, clocks, tribute objects, and imperial archives gathered from across the empire and abroad, while eunuchs, artisans, guards, servants, and laborers sustained its elaborate daily operation.

During the Second Opium War, Anglo-French forces entered Beijing in October 1860. Troops looted the gardens, and British commander Lord Elgin ordered their burning in retaliation for the torture and deaths of diplomatic prisoners. Fire devastated the predominantly wooden halls and scattered collections into institutions and private ownership around the world. Further destruction, stone removal, military occupation, and local reuse followed during later disorder. The event became a powerful Chinese symbol of imperial aggression and cultural loss, while debates continue over restitution, ownership, memory, and how the ruined landscape should be presented.

The park preserves foundations, waterways, earthworks, vegetation patterns, archaeological deposits, and the dramatic stone fragments of the Western Mansions. These masonry ruins are genuine remnants, although many have been stabilized, repositioned, or landscaped for access. Other areas contain restored lakes, rebuilt gates or garden features, modern bridges, paths, exhibits, and planted scenery. They do not recreate the enormous palace complex in full. Archaeology and historical plans allow interpretation of vanished timber structures, but open space should not be mistaken for the original appearance, and the famous Western ruins represented only a small portion of the Qing estate.

Yuanmingyuan Ruins Park functions as a protected heritage landscape and public park under Chinese municipal and national cultural authorities. Access to areas and exhibitions is managed separately and may change. Preservation must balance archaeology, water systems, vegetation, urban pressure, tourism, and the site's role in patriotic education. Responsible interpretation can condemn destructive imperial violence while also explaining the palace economy, Qing governance, artistic collaboration, and labor that preceded 1860. The site's authenticity lies principally in its landscape traces, archaeological fabric, and surviving stone, not in modern scenic restoration or an imagined intact palace.