Halakhah zu Bereschit 24:63

It is permissible le-khatḥila to pray in the plaza of the Kotel (the Western Wall) because it is surrounded by walls on three sides. Moreover, the holiness of the site reinforces one’s love and awe of God, causing one’s prayer to be said with more kavana. The patriarch Yitzḥak did this when he recited Minḥa on Mount Moriah, which was then an open field, as it says: “Yitzḥak went out to meditate in the field” (Bereishit 24:63; Berakhot 26b; Midrash Tehillim §81).