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The enormous Mosteiro de Santo Estevo, on the side of the steep, thickly wooded valley above the Río Sil, dates from the 12th century and has three magnificent cloisters (one Romanesque-Gothic, two Renaissance), a Romanesque-Gothic church and an 18th-century baroque facade. It's now a luxurious parador hotel, but everyone is free to wander round the main monuments and eat in the cafe or restaurant.
Santo Estevo is 5km east from Luintra along the OU0508, then 1km north. The monastery is also a nexus of marked walking trails, including the Ruta Maquino Largaño (PRG178), a 15km loop through woodlands and villages from Luintra; the Ruta Ermida San Xoan de Cahón, which descends steeply 2.5km to the riverbank road; and the GR56 heading 19km southeast to Parada de Sil.