Lying between the Litoral and Prelitoral mountain chains, El Vallès Occidental has places of great landscape value and interesting examples of architecture from every age. The route of Els 3 monts (the three mountains) links the natural parks of El Montseny, Sant Llorenç del Munt and Montserrat along a signposted trail. It conserves a rich heritage of Art Nouveau architecture from the turn of the twentieth century, particularly in Terrassa and Sabadell, but also in Rubí, Cerdanyola and Sant Cugat. The industrial importance of the area until well into the twentieth century can be seen in museums and interpretation centres such as the one in Terrassa. This tourist area has many popular festivals, including La Plantada del Pi in Matadepera, along with many cultural events, such as the season of the Sabadell Friends of the Opera, and other music festivals, such as the Badia Flamenco festival, the Terrassa jazz festival and the Cerdanyola blues festival.

The Folch i Torres Museum Archive, located in Castell de Plegamans in El Vallès Occidental, offers a permanent exhibition of the literary legacy of the five Folch i Torres brothers, which has been brought together through the research of friends, admirers and family members.

This route, which connects some of the most emblematic points in El Vallès Occidental and El Bages, allows walkers to travel some of Sant Llorenç Park and discover some of its lesser-known corners.

• Badia del Vallès
• Barberà del Vallès
• Castellar del Vallès
• Castellbisbal
• Cerdanyola del Vallès
• Gallifa
• Matadepera
• Montcada i Reixac
• Palau-solità i Plegamans
• Polinyà
• Rellinars
• Ripollet
• Rubí
• Sabadell
• Sant Cugat del Vallès
• Sant Llorenç Savall
• Sant Quirze del Vallès
• Santa Perpètua de Mogoda
• Sentmenat
• Terrassa
• Ullastrell
• Vacarisses
• Viladecavalls