The 18th-century exterior buttresses were commissioned to prevent the structural collapse caused by the shifting soft soil near the riverbank.
The nave walls lean approximately 30 centimeters outward from the vertical axis, a result of the building's weight shifting on unstable foundations.
The cloister originally consisted of four wings but only the northern and part of the western sections remain today.
The building houses a museum featuring a collection of religious artifacts and ecclesiastical treasures.
The church was declared a National Monument in 1895.
Colegiata de Santa María de Sar is a 12th-century Romanesque church distinguished by its massive external flying buttresses added in the 18th century to stabilize the tilting nave walls. The structure sits on the banks of the Sar River, outside the medieval walls of Santiago de Compostela. The interior features a three-aisled basilica plan with barrel vaulting. Significant architectural subsidence has caused the interior piers to lean noticeably outward, creating a signature aesthetic imbalance. The attached cloister is one of the few surviving Romanesque cloisters in Galicia, though it was reduced in size over the centuries. Archaeological excavations in the cloister area have revealed layers of historic occupation dating back to the Roman period. The church functioned as a collegiate church for Augustinian canons until the 19th century.
The path alongside the Sar River provides a clear vantage point for capturing the unusual exterior buttresses.
Look for the height markers inside the nave that demonstrate the distinct lean of the supporting columns.
Visit the attached museum to see the remnants of the original cloister and historical stone carvings.
Walk along the Sar River path behind the church for the best perspective of the massive buttress system.
Do not mistake it for the main Cathedral of Santiago; it is a smaller, separate collegiate church.
Typically closed on Mondays.
Maintain silence; modest dress is expected as it remains an active place of worship.
