In the region of Vallès Occidental, Barcelona, we find the town of Terrassa. The backdrop of this ancient Roman municipality is made up of the mountains from Muntanya de Monserrat Nature Reserve, and Sant Llorenç del Munt i L´Obac Nature Reserve.

The town, home to the Egara diocese back in the 5th century, has a rich monumental heritage which includes Visigothic and Romanesque churches of great interest. Sant Pere, San Miquel and Santa María have elements form the 6th and 7th centuries, combined with later modifications from the pre-Romanesque, Romanesque, Gothic, and even Baroque periods. In addition to the novel architectural techniques, we must highlight the Romanesque mural paintings, and numerous Gothic reredos. Medieval Terrassa has left in its city centre many other important monuments, such as the Tower of Palau, and the castle-Carthusian monastery of Vallparadís. At present, both spaces house the Museum of Terrasa. Modernist aesthetics from the late 19th century to early 20th century have left a rich artistic legacy in Terrasa, which includes houses owned by the wealthy bourgeoisie, such as Masía Freixa, factories such as Aymerich i Amat (nowadays the Catalonia Museum of Science and Technology), and public buildings such as the City Hall.