The first and second floors of the Treasury, in Petra, seen from above. The ground floor, with at least 6 chambers, likely royal tombs, is buried under 6 ft of sand and rocks carried by the wind and the floods. A carved door can be seen in the picture through the grate on the left… [1280×768] [OC]

 …These chambers housed skeletons of 12 human skeletons and a trove of grave goods dating back 2,000 years, which are speculated to have belonged to royal family members, indicating a burial complex.

Evidence suggests that when the Romans arrived, they paved over the existing sediment level with a Roman limestone pavement, rather than excavating down to the original ground level.  

Archaeologists discovered the subterranean level beneath the Treasury in 2003, during a period of reduced tourism.

The image aso shows the lateral chamber on the left of what was the first floor and details of what was the third and now is the second floor, like the double columns inside

As usual, my apologies for inaccuracies and mistakes.

Edit: Talking about mistakes, the ground floor is six yards below, not six feet, sorry.

Petra is just bonkers to me. I’d love to go and see it for my self.