the devotion to gaudii runundeep here. japanese sculptor etsuro sotoo has spent 35 years in this church, and this is where he expects to be for the rest of his life, sculpting the figures that adorn gaudii's final masterpiece, consumed by the man and his vision. >> etsuro sotoo ( translated ): gaudii teaches me and helps me solvproblems in my work. for me, he's not dead. >> logan: why did you convert to catholicism? you became a catholic. >> etsuro sotoo ( translated ): i was a buddhist, but after working here, i realized i couldn't do my job without and to know him, you have to be in the place he was, and that was a world of faith. >> logan: gaudii's deep faith is the reason he became known as "god's architect." this is one of the few photographs ever taken of him. he was 31 when he started working on the sagrada famiilia. and over the next 43 years, it became an obsession. >> van hensbergen: he looked like a homeless person. hitrousers were held up with string. his clothes were kind of frayed, and... because all he was i

all those models gaudii had spent years building were smashed to pieces. wow, these are all the original pieces that were picked up from his studio. >> mark burry: yup, and they've been sort of painstakingly identified. >> logan: these shattered fragments were rescued from the rubble and ashes by jordi bonet's father and a team of architects. there are thousands of them locked away inside this room in the sagrada famiilia. they are the structural d.n.a. of gaudii's church. >> burry: they are absolutely the link; not a vague link, not a source of evidence-- it's the source of evidence. >> logan: new zealander mark burry was studying architecture at cambridge university in england when he first came to the sagrada famiilia on a backpacking trip in 1977. he'd come at just the right moment. the architects were stuck. completed, and they were ready to take on the main body of the church, but no one could figure out how to build it as gaudii intended. what were you going to do that they couldn't do? >> burry: my task was to actually reverse-engineer the models,

of gaudii's church. the link; not a vague link, not a source of evidence-- it's the source of evidence. >> logan: new zealander mark burry was studying architecture at cambridge university in england when he first came to the sagrada famiilia on a backpacking trip in 1977. he'd come at just the right moment. the architects were stuck. the second faccade had just been completed, and they were ready to take on the main body of the church, but no one could figure out how to build it as gaudii intended. what were you going to do that they couldn't do? >> burry: my task was to actually reverse-engineer the models, if you like. >> logan: reverse-engineer them so he could understand how gaudii's models were supposed to fit together... >> burry: this is the model maker's workshop. >> logan: ...almost like the pieces of a complex puzzle. he told us gaudii's design was so advanced, there was nothing like it in the language of architecture at the time. in the end, he turned to the design software available. >> burr

of gaudii 's church. are absolutely the link; not a vague link, not it's the source of evidence. >> logan: new zealander mark burry was studying architecture at cambridge university int came to the sagrada famii backpacking trip in 1977. moment. the architects were stuck. the second facc ade had just beeneady to take on the main body of the church, but no one could figuredii intended. what were you going to do that they couldn't do? >> burry: my task was tothe models, if you like. >> logan: reverse-engineer them so he could understand howposed to fit together... >> burry: this is the model maker's workshop. >> logan: ...almost like thepuzzle. he told us gaudii 's design was so advanced, there was nothing like it in the language of in the end, he turned to the most sophisticated aeronauticalble. >> burry: we had to look to other professions who've actually tackled the complexities of the sagradaically complex shapes and surfaces, so the car designers, the shipesigners. they've been grappling for decades wi

envisioned. gaudii 's models to guide them, >> burry: what's extraordinary gaudii put in place using these particular geometries, it all fits within fractions of an inch. >> logan: the spot where we're standing is where they're building gaudii 's central tower. at 566 feet, it will make this the tallest church on earth. gaudii designed it to be three feet shorter than the tallest surrounding mountain, in deference to god. when you finish this tower, it's going to be double where we are right now? >> burry: we're going to get >> logan: mark burry says it will take at least another 13 famii lia, which is paid for entirely by donations to the church. during the pope's visit, jordi bonet was called on to represent the three generations of architects, engineers and gaudii 's vision this far. do you think you will see this complete? >> bonet: this is very difficult to answer. my age is a big age. but it is possible. >> logan: do you have any doubt in your mind that this will be finished one day? >> bonet: oh, yes, i... i alleluia, alleluia... ( bell tolls ) >> this cbs sports update is bro

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