The Basilica of Santa María is an impressive 18th-century Baroque work that stands in Calle Mayor (the High Street) in the Old Part of Donostia. Its most outstanding features are the Baroque façade with its slight Churrigueresque influence, presided over by a sculpture of St. Sebastian the Martyr; and the main altarpiece, dedicated to the Virgin of the Choir, the city's patron saint.
Next to the baptismal font one may admire a cross-shaped sculpture by Eduardo Chillida. The Basilica was built between 1743 and 1774, on the ground plan of an earlier house of worship that had occupied the same site. The main door is positioned in a straight line from the entrance of the Buen Pastor Cathedral.