Made with Mandelbulb3D, single formula used (AmazingSurf). Rendering time on this formula is unusually small, this one took 5 minutes, but most are below 3 minutes (7000X4000px or so!)
I just added a sky taken from my window.
Sorry if a little big, it's already downsized and compressed more than I'm used to do; I was tired to lose details and wanted to use the file as my desktop image.
Oh, the name comes from 2 small holes on the right side of the pass, they looked like a snake bite sign