Written in code and peppered with baffling sketches ... his son Ludovico Sforza took over the project and invited leading artists, including Leonardo da Vinci, to decorate the interior.

Fresh light has been shone on ornate stone carvings at a historic chapel featured in "The Da Vinci Code." Rosslyn Chapel in Roslin, Midlothian, is known for its intricately carved stonework.