The Temple Expiatori del Sagrat Cor is a Roman Catholic church and minor basilica located on the summit of Mount Tibidabo in Barcelona. The building 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, dedicated to the Sacred Heart of Jesus, lasted from 1902 to 1961.
The external appearance of the church is of a Romanesque fortress of stone from Montjuïc (the crypt), topped by a monumental neo-Gothic church accessed by two grand outdoor stairways. 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; the original work was by Frederic Marès (destroyed in 1936) and replaced in 1950 with another by Josep Miret.
The upper church 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 main facade has three sections, the central wider, chaired by the figure of the Archangel Michael in the arch of the main entrance, and John Bosco in the pediment above. Over the left door is the statue of Teresa of Ávila and over the right, Marguerite Marie Alacoque. Above the door is an open gallery of arches with tracery.
The façade of the crypt has a richly decorated tympanum with sculptures by Alfons Juyol i Bach following the design of Eusebi Arnau. The sculptures represent the Virgin of Mercy, Saint George, and Saint James, the patron saints of Barcelona, Catalonia, and Spain, respectively.
The crypt facade consists of three semicircular arches on columns, inserted under a larger semicircular arch, originally decorated with a mosaic of the Holy Trinity by Daniel Zuloaga (destroyed in 1936). In 1955 it was redecorated by the Bru Workshop of Barcelona; the work depicts an allegory of the devotion of Spain, represented by its patron saints.
The interior is divided into a nave and two aisles with semicircular apses, with stained glasses and four rose windows on the facades. In the main altar stands the great crucifix, a work by Joan Puigdollers.
The windows of the four towers contain the Latin phrase tibi dabo ("I'll give you"), the name of the mountain.
The crypt was designed in a neo-Byzantine style, combining Gothic and classical elements, and decoration close to Modernisme. The space of the crypt consists of five naves separated by columns, the central one being wider, all with semicircular apses. The walls and vaults are lined with alabaster or decorated with mosaics, with scenes relating to the dedications of the altars.
From the crypt there is access to a chapel dedicated to the Perpetual Adoration, excavated into the mountain in the late 1940s, consisting of three naves divided by columns. The interior is decorated with marble, mosaics in the pavement, and paintings by Miquel Farré i Albagés in the vaults, made between 1947-1949. Outside of the crypt, on either side of the main door, are two staircases leading to the level of the temple itself.