Palma's cathedral is an architectural wonder that took almost 400 years to build. Begun in 1230, the wide expanse of the nave is supported by 14 70-foot-tall columns that fan out at the top like palm trees. The nave is dominated by an immense rose window, 40 feet in diameter, dating to 1370. Over the main altar (consecrated in 1346) is the surrealistic baldoquí (baldachin) by Antoni Gaudí, completed in 1912. This enormous canopy, with lamps suspended from it like elements of a mobile, rises to a Crucifixion scene at the top. To the right, in the Chapel of the Santísimo, is an equally remarkable 2007 work by the sculptor Miquel Barceló: a painted ceramic tableau covering the walls like a skin. Based on the New Testament account of the miracle of the loaves and fishes, it's a bizarre composition of rolling waves, gaping cracks, protruding fish heads, and human skulls. The bell tower above the cathedral's Plaça Almoina door holds nine bells, the largest of which is called N'Eloi, meaning "Praise." The 5-ton N'Eloi, cast in 1389, requires six men to ring it and has shattered stained-glass windows with its sound. February through November, there's an organ concert here on the first Tuesday of the month, starting at noon.