Overlooking Sarasota Bay like a dream lifted from the Grand Canal, Ca’ d’Zan—“House of John” in Venetian dialect—is a 36,000-square-foot mansion that embodies the opulence, artistry, and cosmopolitan spirit of the 1920s. Commissioned by circus magnate John Ringling and his wife Mable Burton Ringling, the estate was built between 1924 and 1926 as a winter retreat and cultural showpiece.