This is made of phonolite porphyry. phonolite porphyry is a igneous rock, meaning it was formed as a magma or cooled lava. This might have occurred below the surface of earth thousands of years ago and as the top soil gets eroded this rock formation was exposed. https://en.m.wikipedia.org/wiki/Devils_Tower
It wasn't built.....not man made....might help if you can look it up online and read about it..
I can't believe that you think it was built wow
It's a natural formation.
Thanks! Your answer is awaiting moderation.