In front of the Achao plaza is the Church of Santa María de Loreto, Achao —Spanish: Iglesia de Santa María de Loreto de Achao— one of the 16 Churches of Chiloé that were declared Chilean National Monuments in 1979 and UNESCO World Heritage Sites on 30 November 2000.
The Church of Achao is the oldest wooden church in Chile, and this church and the Church of Quinchao are the only churches that remain of those built by the Jesuits.
Construction began around 1740 when the Chiloé Archipelago was still a part of the Spanish Crown possessions, and was completed in 1770 by Franciscan missionaries from Santa Rosa de Ocopa school in Peru following the expulsion of the Jesuits in 1767.

The church forms a part of the Diocese of Ancud.
In front of the Achao plaza is the Church of Santa María de Loreto, Achao —Spanish: Iglesia de Santa María de Loreto de Achao— one of the 16 Churches of Chiloé that were declared Chilean National Monuments in 1979 and UNESCO World Heritage Sites on 30 November 2000. The Church of Achao is the oldest wooden church in Chile, and this church and the Church of Quinchao are the only churches that remain of those built by the Jesuits. Construction began around 1740 when the Chiloé Archipelago was still a part of the Spanish Crown possessions, and was completed in 1770 by Franciscan missionaries from Santa Rosa de Ocopa school in Peru following the expulsion of the Jesuits in 1767.
The church forms a part of the Diocese of Ancud.
Achao