Where are some holy places for legalism?

Some religions or sects of religions are legalistic, but legalism itself is not a religion.

But the place of worship for legalism is in human nature, no matter what religion it is embedded in. In and of itself, it is a form of self worship, or idolatry. That is not to say that adherence to law is evil; it can be part of a true religious experience, and it is the responsibility of citizens in all law abiding nations. But adherence to law simply for its own sake is purely an expression of human nature, especially when overly zealous practitioners of some religions attempt to enforce their law on others without any of the prerequisite faith, repentance or sincerity.