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Throughout New York City’s five boroughs are more than 200 long-overlooked marvels of engineering and architectural beauty—the interlocking tile vaults built by Spanish immigrants Rafael Guastavino, Sr. (1842-1908), and his son, Rafael Jr. (1872-1950). The system of structural tile vaults developed by the Guastavinos—lightweight, fireproof, low-maintenance, and capable of supporting significant loads—was used by leading architects of the day, including McKim, Mead & White and Carrere and Hastings. Ellis Island’s Registry Room, Carnegie Hall, the Bronx Zoo’s Elephant House, and Grand Central Terminal all contain Guastavino vaults.