The Monastery (Al Dier), Petra, Jordan The largest of Petra's monuments the Dier requires you to ride a donkey or walk up 800 steps to get here. The tomb is a 41 by 50 meter structure. This temple or tomb was clearly an important pilgrimage site, with worshippers and priests using a processional route to congregate in the open area in front of the monument. From the 4th century onwards it was used as a monastery during Christian Byzantine era when crosses were painted on its rear walls.