This book contains the best images from the first century of the history of the Sagrada Familia. Through the eyes of photographers such as Ballell, Mas, Roisin, Zerkowitz, the Merlettis, Brangulí and Francesc Català-Roca we rediscover the popular «cathedral of the poor» by the great Antoni Gaudí. Their images are preserved in prestigious collections of the city, such as that of the College of Architects, or around the world, such as the George Eastman House in New York. They are an exceptional document of the construction of one of the principal urban icons of Barcelona