Challenge: Have all of the Wonders of the World survive, except the Pyramids

Ok chaps , ill bite. this might take a few days , but ill outline prospective Tls on all the monuments with my 2 cents.

1. The Hanging Gardens of Babylon

If we choose to ignore the arguments that the gardens were mythical , or that the Greek historians were confusing them with the much leafier centres of Nineveh , then we are bound to take Herodotus's description of Gardens. What he describes is quite different to the ziggurat type structure that other posters have suggested was built , instead describing a terraced courtyard in the shape of a lengthened rectangle built with two walls sharing the massive fortifications that surrounded the city. This model offers our longevity quest several advantages and makes a lot more practical sense. Rather than having a hollow structure permeated by waterways it would have been more logical to construct one of banked earth held in place by retaining walls , the gardens watered then by buckets (or screws) fed from the moat on the other side of the outer walls. In OTL , this section was as vulnerable to flooding as the rest of the city , which was largely wiped clean by the regular inundation of the Euphrates. Only the foundations remain of the "southern Palace" , far too little to determine whether they were the site of the famous gardens. By integrating the gardens into the walls , they stand the greatest chance of survival.

How do we preserve this structure? Well , the first part of the equation is to remove the source of so much destruction; the River. Meandering over the floodplain and apparently diverted several times by human endeavour , this is not as impossible as it may initially appear. An obvious way forward would be to presume that it shifted course to the west earlier in our ATL , moving away from the city a little and forcing the Babylonians not only to build more effective flood-control structures , but to construct a river-wall. The importance of this will become clear momentarily

The second great threat to the city and its gardens , the one that would eventually see its abandonment and decay , was its weak defensive position. Situated at the banks of a river on a floodplain , the massive walls previously mentioned were necessary to overcome the lack of natural defences. However , the lack of walls on the river side was always a strategic liability , and several attackers used a water entry to gain entry and sack the city. However , with the river now further away and the mighty walls shifted to cover this weak spot , it is a reasonable assumption that Babylon would see less destruction of that sort , perhaps earning a reputation similar to that of Constantinople.

The next issue to overcome is to keep the city relevant active through the dark ages and into the Islamic era. If the river is kept in check and the walls remain there is no reason that its great libraries and palaces wouldn't encourage it to become part of one the centres of thought and learning , the Southern Palace becoming the cities primary centre of power after the destruction of the northern one by fire or erosion. With a renewed dynasty of kings in residence the gardens are far more likely to survive , albeit expanded or altered at the whim of individual rulers. Indeed , If Mesopotamia remained the centre for Islamic civilisation longer (avoiding the shift to the Levant and Arabia) , they are likely to be maintained into the modern era. After all , formal gardens of this type were much prized in Palace architecture of that era , and several examples remain in existence across the middle east. It is not out of the question to think that had they lasted until the end of the 1st millennium that the hanging gardens could have survived to serve the sultan of Babylon as well as they did Nebuchadnezzar.
 
I think that it would be almost impossible to keep them all around. Even if nothing actively destroyed them, then they would wear down.
And it's quite possible that some ruler might decide that say, the temple of Artemis, was not grand enough, knock it down, and try to build something more impressive.
 
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