Those can be shown to be natural, but nobody has been able to show megalithic walls to be natural. Nature doesn’t do square blocks for miles on end naturally.
With steam pressure from volcanic activity, trapped water moisture in the stone, sub-zero winters, and millions of years to repeat cycles, it's feasible to find rectangular cuboid shapes in rock. Size is a matter of perspective when it comes to the Rocky Mountains.
By direct line, Sage Mountain looks to be about 125 miles from 'Old Faithful' geyser in Yellowstone National Park.
They haven't been able to show them to be unnatural either.
“Nature doesn’t do square blocks for miles on end naturally.”
Hardly that: “275 feet (84 meters). Reaching up to 25 feet (8 meters) high”
See the small blocks to the left of the man? Why would builders use smaller blocks for the base? And other pictures show it isn’t a precision work like the story claims. I’m skeptical.