Khirbet et-Tannur placed ca 70 kilometers north of Petra was Nabatean hilltop open-air sanctuary. Originally it was a simple altar on the top of hill. Located on the caravan road from Petra it developed into a complex aroud the altar by adding a temple, colonnades, and additional. Sanctuary existed from the IIIrd century BC till fourth century AD.
See:
- http://www.classics.ox.ac.uk/khirbet-et-tannur-nabataean-temple-project.html
- http://www.ocla.ox.ac.uk/pdf/khirbet_tannur.pdf
- http://www.megalithic.co.uk/article.php?sid=27212
- Age of Spirituality: Late Antique and Early Christian Art, Third to Seventh Century : Catalogue of the Exhibition at the Metropolitan Museum of Art, November 19, 1977, Through February 12, 1978, Metropolitan Museum of Art, 1979, pp. 181-182
- Peter Alpass, The Religious Life of Nabataea, Brill 2013, pp.202ff