I assume it would have something to do with the way this realm manifests. If... if there is no 'ruler' over a section, no one to shape the domain, it will form itself to those who enter.

[Though why ruins, he wonders. Is it because this where La Llorona came from, a spirit who can do naught but destroy? Or is it... because those who are regaining memories, incomplete pieces, are considered shattered somehow?]