The voices of a babel of tourists float up to the rock ledge as does the clatter of hooves from the horses used to pull small carriages through the siq as far as the Treasury or al Kazneh.
Al Kazneh, with its soaring columns and carved pediments, is spectacular but I've fallen in love with the view from above.
Mountains slashed with ravines, slopes littered with rock slabs and boulders, the ground under our feet strewn with fragments of terracotta pots.
A small girl swathed in a shawl is herding sheep that are grazing on the scant grass and among small clumps of miniature white tulips. Their drinking water comes from the reservoirs built by the Nabateans two millennia ago.
Harbi and I climb further to the High Place of Sacrifice. Below us a Bedouin girl sits beside the jewellery she hopes to sell to passing tourists.
Harbi, a local, calls out to her: "I am lost, how do I get down?" She looks up, a little quizzically.
She points out the gully that Harbi has already told me is the way down. When we reach her she scolds him: "I thought you were a tourist."
The Nabateans had hewn an almost horizontal platform from the rock spur overlooking the siq for their sacrifice place.
There are channels for blood, reservoirs for fresh water and platforms for the offerings.
Wind buffets us. Harbi still makes me peer over the edge where a near-vertical drop ends on the top tiers of a 7000-seat Nabatean theatre.
A conga line of tourists is passing the theatre, snaking its way along the colonnaded street towards tombs, temples and lunch.
They are attended by Bedouins offering camel and donkey rides, and coins of doubtful provenance. A tour guide waves a furled umbrella and shouts instructions to her straggling group.
But up here it's just us among the rocks striped like wavy candy canes, the discarded ancient pot handles and broken flints.
The ghosts of the long vanished Nabateans live on up here - and that truly is a wonder of the world.