Di tích Nhà Pha is a French colonial complex built in 1890 in Đông village, An Hải commune, originally comprising an office building, a lighthouse (nhà đèn), and a kitchen. 'Nhà Pha' derives from the French 'phare' ('lighthouse'), reflecting the site's original role as a French lighthouse and administrative compound - not, as sometimes assumed, from 'maison de force'.
The 1945 Uprising
On August 16, 1945, as part of the nationwide August Revolution, Lý Sơn's residents rose up to seize power here, raising the red flag with the hammer and sickle at Nhà Pha itself.
French and American Detention
The French reoccupied the island in 1951 and turned the complex into a detention centre, imprisoning more than 120 people; roughly 100 more resistance fighters and suspected sympathisers were arrested and held in 1953. The United States later used Nhà Pha as its own base and detention site during the war, holding revolutionary figures including Võ Khế, Trần Quy, and Lê Thiện.
The Surviving Office Building
The former office building survives as the only remaining example of French colonial architecture on the island, with interior walls up to 60cm thick and underground water cisterns beneath the floor for natural cooling and heating. The site was recognised as a provincial-level historical relic by Quảng Ngãi province in 2014.