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Hagia Sophia Grand Mosque in Istanbul.
Built in 537 by the late Romans and still standing even though it's in a relatively active earthquake zone, it's amazing it's been around for 1500 years without collapsing. The central dome is so huge and so high, it's amazing to think how they built it back then without modern machinery or technology.
IIRC it did collapse, though very early on in its life. Like, barely after it was built. Got hit by earthquakes. But it was repaired, obviously.
So the answer is Maintenance.
I bet some bridges in America could do with some of that.