This would be a major departure from what happened in the first Mighty Morphin’ Power Rangers episode, where Zordon simply teleported them into the base when they were miles away.
In Mighty Morphin’ Power Rangers, this base was located in the desert, which is a close match to the environment in the photo.
One possibility is that this wall is part of the Command Center, home to Zordon and Alpha 5, the Power Rangers’ allies.
At some point in the story, the Rangers somehow find the Command Center out in the middle of nowhere, leading Zordon to either willingly welcome them within or them finding a way in themselves.