Another remarkable colonial mansion, built by one of the Yucatán's wealthiest hacendados in the early 19th century, has been put to more prosaic contemporary use for state offices but is open to the public on weekdays. It is most famous for its massive Carrara marble stairway, curving to the open, light-filled second story. Surrounded by pale mint-green walls punctuated by white columns and sinuous Moorish arches, you feel like you're standing on a colossal tiered wedding cake. Art Nouveau curlicues in the iron railings and black-and-white checkerboard floors are, well, the icing on the cake.