The building on the summit of Mount Tibidabo, is the work of the Spanish architect Enric Sagnier and was completed by his son Josep Maria Sagnier i Vidal. The construction of the church, lasted from 1902 to 1961.
The external appearance of the church is of a Romanesque fortress of stone from Montjuïc. The upper church has a central floor with an octagonal dome on eight columns. The dome is crowned with an image of the Sacred Heart, is square with three apses, a large central tower, and four lower towers marking the four corners of the square, and statues of the Twelve Apostles sculpted by Josep Miret.
The interior, In the main altar stands the great crucifix, a work by Joan Puigdollers. The church is crowned by the enormous bronze statue of the Sacred Heart made by Josep Miret in 1950, replacing the original made by Frederic Marès in 1935, and destroyed the following year, as the Spanish Civil War began.