Matthew Evans - Where are you Axis Mundi?

In many tribal there exists this idea of Axis Mundi, or sacred places where one can gain a higher place. It could be a specific place, a mountain top, a tree, or a sacred place, but its usually tied to nature. There is a strong communal attachment and there are usually intense rituals associated with and a sense of enlightenment. My question, is where is Axis Mundi in American (or anywhere for that matter) Christianity? Sure we have our churches, but where do we have sacred outdoor spaces? I don’t think we have them; but think it would be an interesting questions for someone to research on.