Welcome to the forum! You’ll have fun here, I’m sure!
As you can see, I had a very high contrast photo to start with, that helps a lot. As @toolboy points out, Inkscape does have a Trace Bitmap function that will produce vectors from a photo with well defined edges. If I had used Inkscape directly, I probably would have first shifted the contrast a bit more and made a black and white image to trace. Even then I’d have some manual work to add and repair nodes.
In this case, however, (and I use this method more and more as my proficiency increases) I used Affinity Photo to process it to an image that was easily traced without any further correction. There are plenty of very good tutorials that show how to use Affinity Photo to derive a traceable image, especially in select areas. The main tool I used here, because the main challenge was to remove the sky and make everything else opaque, was a tool called ‘Flood Selection’. With this tool you click in the area you want to select (the sky in this case) and simply drag the tool to increase or decrease the sensitivity of the selection and it will select all the pixels that are similar to where you clicked. It took less than a minute to select all of the main sky regions (once I knew what I was doing), and then a bit more fiddling to select the very small regions within the Arch and some areas where there were clouds (hard to see in the photo, but they’re there). I saved that photo, imported into Inkscape, traced the bit map, and exported to SVG. That was imported into SheetCam and out came a nice piece of metal representing the Arch. I’ve since done a similar thing with Laser ‘engraved’ coaster:
Affinity Photo is a great program, it costs about $45USD with a one-time, lifetime purchase. I highly recommend it and its sibling, Affinity Designer.