The Concatedral de Santa María de la Redonda is a prominent Roman Catholic cathedral located in Logroño, Spain. It was built in the 16th century and features a mix of Gothic and Baroque architectural styles. The cathedral is known for its stunning twin towers and beautiful interior, which includes impressive altarpieces and religious artwork. This co-cathedral serves as a significant religious site for the Diocese of Calahorra and La Calzada-Logroño. It is also a popular tourist attraction, drawing visitors who admire its historical significance and artistic treasures. The cathedral plays an essential role in the cultural heritage of the region.