The Tile House as the locals call it, is a Moorish folly in Bay Shore, N.Y., built by Rafael Guastavino Jr., who with his father, Rafael Guastavino Sr., developed the tile vaulting system used in Grand Central Terminal’s Oyster Bar, the Whispering Gallery outside it, and other iconic spaces, like the Cathedral of St. John the Divine and Carnegie Hall. Guastavino built this house when he was working on Grand Central.