Great little scene, with a spiral set of steps.
You seem to have something odd with the section just below the tallest tower roof. Some geometry out of place or facing the wrong way. Compare it to the similar tower there and you may be able to work out the problem.
Welcome to this site!
Minor note, you posted in the ‘talk’ section. just usual to post your work in the ‘show’ section, that way more people will notice it!