Inside the Boí valley, in the region of Alto Pirineo, Lerida, we find the small town of Erill la Vall. The church of Santa Eulàlia is included in the collection of Romanesque temples from this valley that was declared a World Heritage by UNESCO.

Located in the region of Alta Ribagorza, Lerida, the Boí valley is located in the westernmost part of the Catalan Pyrenees. One of the towns found in this valley is Erill la Vall, a picturesque place filled with traditional houses, built in the local style of architecture, which uses materials such as wood, stone, and slate.

The relevant role played by the Boí valley in the Middle Ages left an important architectural legacy, one of the most remarkable in Catalonia. The church of Santa Eulàlia, in Erill la Vall, dates from the 12th century, the same as the rest of the neighbouring temples, all of them built in the Lombard-Romanesque style. The building, fully remodelled, has one nave with a central apse, and an attached, slender belltower that is six storeys high. Inside we can see some remarkable mural paintings, as well as the sculpture grouping that depicts the Descent from the Cross, presently kept at the Catalonia National Museum of Art (MNAC) and Vic Episcopal Museum (MEV). The importance of the compound formed by this and the other churches in the valley lead to their inclusion in the list of World Heritage Sites in the year 2000.