The catacombs of Paris (former underground rock quarries) have been built with several levels. This shows one of the few passages (stair) from the 1st level to the 2nd level (below).
Scanned with the iPhone12 Pro and 3dScannerApp. Please feel free to follow my collections of daily scans ([link](https://skfb.ly/6YuwK)) as well as my scans in San Francisco, Paris, or in the catacombs: [link](https://sketchfab.com/edemaistre/collections)