Sources - Midrash
Rabban Gamliel, R’ Elazar ben Azariah, R’ Yehoshua and R’ Akiva … On another occasion they were coming up to Jerusalem after the destruction of the Temple. When they reached the Mount of Tzofim and were able to see the city of Jerusalem in its destruction, they rent their garments. When they came to the Temple Mount, they saw a fox emerging from the Holy of Holies, and they started to weep. But R’ Akiva smiled.
The Temple and the Western Wall / Rabbi Zalman Koren
The book of Psalms describes God's appearance in the world as, "From Zion, the finery of beauty, God appeared" (Psalms 50:2). The Sages (b. Yoma 54b) explained that this verse describes the first time God appeared in the material world, and that Zion is the place where the world was created. At this juncture between the material world and the unfathomable reality of the divine lies a stone. It is called Even HaShetiyyah, the Foundation Stone, because the world was created from it. Later, the Holy of Holies, the most sacred place in the Temple, was built above it, and the Ark of the Covenant on which the divine presence rested was placed in the Holy of Holies.