1. Mecca and Medina are two of the most holy cities of Islam. Non-Muslims are not allowed to step foot on these holy grounds. 2. The Rub’ al Khali, or the Empty Quarter, is one of the driest places on earth. This desert, which is 1,000 kilometers (620 miles) long and 500 kilometers (310 miles) wide, occupies a large portion of Saudi Arabia. 3. It is strictly...
