Although the interior is temporarily closed to the public, tour buses line up for the jewel of the palace (and Palermo), one of Norman architecture's greatest achievements in Italy, the 12th-century Palatine Chapel (Cappella Palatina).
The interior is closed to tours because it is falling apart.
mnli hypothesis: The interior is closed to tours because it is falling apart. premise: Although the interior is temporarily closed to the public, tour buses line up for the jewel of the palace (and Palermo), one of Norman architecture's greatest achievements in Italy, the 12th-century Palatine Chapel (Cappella Palatina).