Aerial view of Qasr al-Farid, the largest tomb within Site of Hegra (Madain Salih), UNESCO, in the area of AlUla, Medina Province, Saudi Arabia

hegra madain salih tomb alula saudi arabia desert architecture ancient civilization historic burial site sandstone archaeological cultural heritage landscape aerial view ruins rock formation tourism history preservation exploration travel natural beauty sandy terrain inscriptions landmarks geology scenic vastness significance monolithic discovery adventure historical landmark wonders forgotten notable sites arid environment