The King Abdullah Mosque is named after the first king of the Hashemite Kingdom of Jordan, Abdullah I. It is one of Amman's landmarks, and the blue domes decorated with ornate mosaics are striking in a white building. This is the only mosque in Amman open to non-Muslim visitors. The magnificent octagonal prayer hall does not have a pillar support, and the top is a 35-meter-diameter dome engraved with sections of the Islamic Qur'an. Interestingly, there is a church directly opposite the entrance to the mosque. The two religious buildings are just across a street.