Better than Plato's Cave - Megila 19b

Rabbi Hiyya Bar Abba teaches in the name of Rabbi Yochanan, "If in the cave where Moshe and Eliyahu stood there had been a hole even as large as a small thread, they would not have been able to withstand the light, as it is written, (Exodus 33:20) 'For one cannot see Me and live.'"  

So Moses and Elijah's famous encounters with G-d (the 13 attributes of Mercy for Moses, and the still small voice for Elijah) both took place in the same cave.  Neat!