Since the time of ancient Rome, architects, engineers, and builders have struggled with the problem of building domed ceilings over large spaces. No one was more skilled at this than the Rafael Guastavino family, a father and son team of Spanish immigrants who oversaw the construction of thousands of spectacular thin-tile vaults across the United States between the 1880s and the 1950s. This long overdue first monograph features archival images, drawings, and beautiful new color photography showcasing the most incredible Guastavino vaulted spaces. An extensive appendix lists the addresses of all known extant Guastavino vaults, over six hundred masterpieces small and large.