--- title: IMI, National Geographic and the Great Cathedral Mystery description: IMI National Training Director Robert Arnold along with other IMI staff were sponsored by National Geographic to help construct a scaled down version of Brunelleschi's Dome in Florence, Italy for a program on the engineering of the world's largest brick dome. image: https://info.imiweb.org/hs-fs/file-2553751812-jpg/Images/duomo-cardedit-300x225.jpg --- [![IMI_logo_primary_forweb_ret_400](https://info.imiweb.org/hs-fs/hubfs/IMI_logo_primary_forweb_ret_400.png?width=174&height=34&name=IMI_logo_primary_forweb_ret_400.png)](https://www.imiweb.org/) - BUILDING SOLUTIONS - SOLUTIONS - [New Construction](https://www.imiweb.org/new-construction/) - [Restoration](https://www.imiweb.org/restoration/) - NEW CONSTRUCTION ASSEMBLIES - [Brick](https://www.imiweb.org/new-brick-construction/) - [Concrete](https://www.imiweb.org/new-concrete-construction/) - [Concrete Masonry Units](https://www.imiweb.org/new-concrete-masonry-construction/) - 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"NOVA's Great Cathedral Mystery" produced by National Geographic Television in association with Camera One Productions premieres on PBS February 12, 2014. Click [HERE](http://www.youtube.com/watch?v=ba3pFuDFI_k) to see a promo of the show. 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