The Sagrada Familia crypt, located one level below the apse of the Basilica, is the resting place of Antoni Gaudi, the man behind the Sagrada Familia.
It consists of four chapels dedicated to the Virgin of El Carmen (the site of Gaudí's tomb), Christ, the Virgin of Montserrat, and Christ on the Cross (the site of the tomb of Josep María Bocabella). When you look toward the sky, you’ll see a beautiful sculpted image of the Annunciation to Mary, right at the point where the arches of the crypt meet. Looking down, you’ll see that the floor of the crypt is covered in a breathtaking mosaic of Roman origin.