The Nativity façade is the unique part of the temple directly built by Gaudí. When Gaudí died in 1926 only the tower of San Barnabas was totally finished and the other three very much advanced. This façade has been recently declared WORLD HERITAGE by the UNESCO. It is formed as the other façades by four bell towers of square plant in its base, that comes to be a cylindrical structure when arrived at one fourth of their height. Further up, they come to a parabolic profile to become a pinnacle that crown each one of the towers. The three spaces remaining among the edges, are take up by three entries forming the portico.
Nativity façade	Cypress with doves as purity symbol		Tortoise supporting a column
The bell towers: With a height of 107 meters the two inside and of 98 meters the outsides. This is one of the most characteristic and main elements of the façade. Totally accessible through spiral stairs leaving an important central empty space and catching up to the top. All the length of the bell towers is opened through a sort of stone blinds allowing the tubular bells sound diffusion planed by Gaudí. The silhouette of the upper part resembles a Bishop's staff. Other symbols to see, are the knot symbol of the bishop's ring and in the culmination a golden cross showing the capital letters of the apostle to whom the tower is dedicated. Each one of the towers of this and of the other two facades, twelve on the whole, four for each one, is dedicated to an apostle. Those of the Nativity façade, are dedicated to Saint Barnabas, Saint Simon, Saint Judas Thaddeus and Saint Mathew. Each one of them is represented in a great seated statue, placed in the point in which the towers pass from a square structure to another circular one, what permits to do, in the triangular spaces resultant, balconies serving them as base. The ornamentation includes the names of Jesus, Mary and Joseph linked together with palms and with the word "Sanctus" repeated nine times in each bell tower, in different colours: yellow when dedicated to God father, red when dedicated to God son and orange colour when dedicated to the Holy Spirit. For the pinnacles, Gaudí imagined between 1914 and 1922 different solutions. In the last one finally adopted, the pinnacles are  culminate with stars doing as a crown and by underneath, six signs with the mention "Hosanna" and "Excelsis".
Bell towers seen from  the Passion façade	Bell towers front view	Barnabas and Simon apostles  with the Montserrat mountain	Thaddeus and Mathew apostles  with the Immaculate Conception

The portico:
Gaudí designed for this portico an impressive iconography in which besides the religious figures, enormous quantities of vegetable elements have been carved making a link among the different religious motives in a imaginative explosion of life.
The portico is composed by three entries devoted to the three Christian virtues: the Faith (to the right), the Hope (to the left) and the Charity (in the centre) with a fantastic representation of the life of Jesus.
The archivolt of each entry continues up forming a flashlight finishing in a pinnacle.

Two views of the Nativity façade portico

The Charity hallway, that is the central one, is divided into two different entrances by a column that supports statues of Jesus, Mary, Joseph and angels, completed to both sides by sculptural groups representing the adoration of the kings and the shepherds.
In front of the large window of the two ogives composed tympanum and a rose window we see the star of Bethlehem and on some pedestals the image of the Archangel doing the Annunciation to the Virgin.
Further up, we find musicians angels figures, all it surrounded by a vegetable world with flowers of several species and animal and birds, covering all the surface of the portico and giving it an impressive aspect unity for a so large surface. In the upper part of this ensemble, a representation of the signs of the Zodiac is found just as they were found the night of the birth of Jesus.
Further up and in a cave surrounded by birds, we find the images of the coronation of the Virgin. Further up, other images  culminating in a sort of pinnacle constituted by a cypress with pigeons symbol of the purity and that among others decorative symbols raises itself between the two central towers and far above the base of the tympanum.

General view of the Charity entry	Virgin Coronation	The Birth of Jesus on a column  with his genealogy
Adoration of the Magician Kings	Adoration of the shepherds

The Hope hallway, is the situated to the left, is a lot more small than the central one and exceed him something less on the façade, it has a single door. Contains also an exuberant vegetation in this case aquatic, because in this scenes the Egypt escape is represented and also the sacrifice of the "Sants Innocents" (Fool saints).
At the base of the pedestals, it is aquatic fauna and gooses.
The entry is presided by a statue of Saint Joseph with the child Jesus standing. Also images of Saint Joachim and Holy Ana. The flashlight culminates in a pinnacle that represents the mountains of Montserrat and on top the group of the marriage of the Virgin and Saint Joseph.
In the top end, an imperial crown on a polyhedral star.

Two general views of the Hope entry		Virgin Mary and Saint Joseph marriage	Angels playing clarions

The Faith hallway, located to the right of the central one, it is of similar dimensions to the one of Hope. With a single door, we find in it pedestals with domestic birds and vegetables and a frieze of arabesque.
On top and to the right side, an image of Jesus working in a bank of carpenter and Joseph and Mary seeking Jesus in the temple. To the left, the Visitation of the Virgin to his Holy cousin Isabel and further up Zachariah, Saint John Baptist father. Further up in a niche, an image of this saint. Over the lintel of the door and presiding the entry, an image of Jesus seated at the age of twelve.
The tympanum has a large ogive and a rose window. The archivolt is decorated with an exuberant vegetation with branches of apple tree, to the left some angels playing clarions among others decorative elements.
The flashlight seemed to the central one is concluded by a pinnacle in whose interior there is an image of the Immaculate Conception and on top the group of the Presentation of Jesus in the temple, composed by the images of Joseph and Mary prostrated and Simeon with the child Jesus.

Faith entry, two views		Angels playing clarions	Presentation of Jesus in the temple and S. Trinity	Music: Harp and angels playing clarions

Scupltures and sculptors:
The artists sculptors collaborating with Gaudí in the decoration of this facade were Llorenç Matamala i Piñol, Carles Mani i Roig and Jaume Busquets. Subsequently other artists as Joaquim Ros i Bofarull intervened.