San Miguel de Lillo is a pre-Romanesque church located in Asturias, northern Spain. Built in the 9th century, it is known for its unique architectural style, featuring a rectangular layout and intricate stone carvings. The church is part of the UNESCO World Heritage Site that includes other significant monuments from the same period. The structure is dedicated to Saint Michael and showcases the early Christian influence in the region. Its historical significance lies in its representation of the Asturian monarchy's efforts to establish Christianity in the area during the early Middle Ages. Visitors can appreciate its artistic details and serene surroundings.