Muslim travellers want to know if it is permissible to visit, enjoy and appreciate the city of Petra in Jordan, which was the capital of the Nabatean civilisation. They also want to know the same about the second largest city of that civilisation which is called al-Hijr and is in Saudi Arabia. The area of al-Hijr is now known as ‘Mada’in Salih’ (The Cities of the Prophet Salih), leading a great deal of Muslims to think that the destroyed people of Thamud, to whom the Prophet Salih was sent, were the Nabatean people.