Mark 13:1-2

1 Then as He went out of the temple, one of His disciples said to Him, “Teacher, see what manner of stones and what buildings are here!”

² And Jesus answered and said to him, “Do you see these great buildings? Not one stone shall be left upon another, that shall not be thrown down.”

Also found in Matthew 24:1-2 and Luke 21:5-7.

Matthew’s account of the afternoon’s events includes a significant statement just prior to their exit from the Temple: “Behold your house is left unto you desolate” (Matthew 23:38 as quoted from Jeremiah 12:7). Thus [the disciples] probably wondered why such beautiful buildings would be abandoned. — KJBC, page 1255.

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The word “buildings” refers to the mass of separate edifices, enclosures, colonnades, halls, sanctuaries, composing the Temple enclosure. Some of the stones were massive, weighing over one hundred tons. — Wuest, page 244.

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thrown down (v.2) — literally, “to loose down.” It speaks of a gradual demolition of the Temple, such as took place when the Romans captured Jerusalem in A.D. 70, and destroyed the Temple. Our Lord’s prediction was fulfilled in exact detail. Only the foundation stones remain of all that magnificence. A double negative appears twice in our Lord’s answer, making an emphatic negation. — Wuest, page 244.

See my post on this occasion from Matthew 24:1-2. It points to a still-future fulfillment and not the destruction of the Temple in A.D. 70.