he was 31 when he started working on the sagrada famiiilia. and over the next 43 years, it became an obsession. >> van hensbergen: he looked like a homeless person. his trousers were held up with string. his clothes were kind of frayed, and... because all he was interested in was the sagrada famiiilia. i mean, that was every waking hour, to the point, at the end of his life, actually, where he was sleeping on the site. >> logan: gaudiii died suddenly at this intersection in 1926 when he was hit by a tram. the driver pushed him aside, mistaking the beloved architect for a tramp. >> van hensbergen: the photos bereft of their builder, the builder of god. >> logan: after his death, the builder of god's plaster models continued to guide construction for the next ten years, until 1936, when the spanish civil war broke out. anarchists attacked the sagrada famiiilia. this photo captures smoke billowing from its side. all those models gaudiii had spent years building were smashed to pieces. wow, these are all the original pieces that were picked up fro

: when pope benedict came to the sagrada famiiÍlia two years ago, it was the first time mass had evereld here. in an ancient tradition as old as the catholic church, he consecrated the sagrada famiiÍla as a basilica. not since 1883, when it was envisioned by antoni gaudiiÍ, hd it been seen in all its glory. 800 voices filled the air, one of the largest choirs in the world, and close to 7,000 people gathered, celebrating a moment that had taken 128 years to arrive. while the inside is mostly finished, outside, there's still much to be done. you can see the spires and construction cranes for miles. watch as this picture moves in from above-- those tiny figures below are people dwarfed by the massive faccÇade rising from the main entrance of the church. antoni gaudiiÍ was profoundly devout, and this was his way to make amends to god for the sins of the modern world. >> gijs van hensbergen: i mean, he wanted to write the history of the whole of the catholic faith in one building. i mean, how crazy and how extraordinary and how ambitious and how, in a sense, megalomaniac that idea is. >> l