What prevents Dungeons from collapsing?

One of the ideas I've had for a story is to have million year old subterranean buildings/cities/temples which have younger architecture built on top of them, resulting in a "dungeon" which would be an archaeologist's dream.

My question is how deep can this type of structure be before it just collapses under its own weight?

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What prevents Dungeons from collapsing?

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