The Laurentian Library in Florence, Italy was commissioned in 1523 and construction began in 1525 under Michelangelo's design and guidance. It contains manuscripts and books belonging to the Medici family. Michelangelo pioneered Mannerist architecture in the vestibule and staircase, featuring recessed columns, convex stair treads, and ample windows lighting the reading room. The library opened in 1571 and houses over 11,000 manuscripts and over 130,000 printed works. It is one of Michelangelo's most important architectural achievements.