Some houses explain an artist better than any retrospective. The places on this list weren't just lived in - they were made, obsessively, room by room, often over decades. A cobalt-blue courtyard in Coyoacán. A glass box lifted above the São Paulo rainforest. A Sussex farmhouse where no surface escaped a paintbrush. Most are open to visit, a few take planning, and all of them reward it. These are ten worth knowing about.