Time can be holy, and place can be holy.
Yom Kippur, for example, is a holy point in time, a chance to review our lives and start anew. Shabbos, in its own special way, is also a special island in time, distinct from the weekdays before and after it. The Kotel, on the other hand, embodies holiness of place. Here, for some reason, we are able to open ourselves up to G-d in special ways. Suddenly, we find ouselves rushing to put a note in the Wall, hoping to reach out to our Creator.