At the southern end of the Costa Daurada is Amposta, one of the most traditional towns on the mouth of the river Ebro. Proximity to the Ebro Delta Nature Reserve makes it a favourite destination of nature lovers. Amposta, capital of the region of Montsià, preserves some vestiges of its medieval origins, such as the remains of its castle. The streets of its historic quarter preserve notable examples of modernist architecture, outstanding among which is Casa Fàbregues, as well as significant works of engineering, such as the emblematic suspension bridge which spans the Ebro (1919). Also on the banks of the river is one of the town's most representative structures: the tower of La Carrova (14th century), which defended the entrance to the estuary. One of Amposta's greatest attractions is its proximity to the Ebro Delta Nature Reserve, considered to be one of the most important wetlands on the Mediterranean. The delta is formed by a series of channels, lagoons and sandy ground which attracts a large number of birds, as well as being an ideal place to grow rice. A good way of discovering the beauty of this area is to take a tour by boat leaving from the river port of Amposta. The hermitage of Santa María del Montsià, which falls within the town's boundaries, is the scene of a popular pilgrimage every year.