1. The Monreale Cathedral (Duomo di Monreale) is a beautiful and historic building located in the town of Monreale, just outside the city of Palermo in Italy. It was built in the 12th century by King William II of Sicily and is considered one of the finest examples of Norman architecture in the world. The cathedral boasts intricate mosaics that cover the walls, floors, and ceilings, depicting scenes from the Bible and stories of saints. The mosaics are made from over 2 million pieces of gold and colored glass, and are considered some of the finest examples of Byzantine art in Italy. The cathedral also features a large rose window, carved marble columns, and a beautiful cloister.

2. The Monreale Cathedral is open to visitors every day from 9am to 5pm. The phone number for the cathedral is +39 091 640 1914.

3. Tickets to the Monreale Cathedral can be purchased at the entrance. The cost is €10 for adults, €5 for children aged 7-14, and free for children under 7. It is possible to book a guided tour in advance. The best way to reach the cathedral is by car or bus. There is a regular bus service from Palermo to Monreale that takes around 30 minutes. It is also possible to take a taxi or hire a private car. The address of the cathedral is Piazza Guglielmo II, 90139 Monreale PA, Italy.