This has to be one of the most beautiful works by the architect Cèsar Martinell. The winery of the Agricultural Union of Saint Isidre of Nulles, on the outskirts of the town, was the third commission in just one year for the most celebrated of the Catalan agricultural architects. With certain lines that remind us of Gothic art, the architecture of the Nulles winery is refined, monumental and elegant.

The structure of the building is slightly different from Martinell's previous works; the construction of Nulles comprises two areas measuring 21 by 18 metres without a separating wall between them. A slender, durable and lightweight "skeleton" that gives the feeling of vastness and allows one to create an open and orderly space. The winery has yet another space, a transversal nave with a simpler structure, based on metal trusses and a sheet metal roof.

The monumentality of the façade fully justifies the name of "wine cathedral". The double basilica area can clearly be seen thanks to its two identical, symmetrical fronts. It has a solid base of stone that runs along longitudinally, broken only by the two doors of each area. The portals outline a parabolic arch and protrude slightly to support the large windows situated above them (also parabolic arches and brickwork). The façade shows off the vertical brickwork pilasters, from the wall front up to the roof where the stepped finish form a symmetrical slope on both sides;  the blind arches and original corners of the façade made from brick pillars forming low relief are also outstanding.