Sanctification. It means "setting something apart."
We all have things in our lives that we sanctify, whether it's that one outfit that you only wear for extra-special occasions, or something more abstract, like the exact way you feel about your significant other when they give you that one look that makes your knees go a little weak. You know exactly what that feeling is like, but you don't share it. Those things are set apart somehow, to a greater or lesser degree, and their set-apartness gives them a kind of reverence, a kind of holiness.
But what about an actual place? Have you ever thought about sanctifying a space?