That is when you can actually see THE SECRET GAMEOVER FMV IN WHICH THE MISSILES HIT THE GARDEN AND IT REMAINS COLORFUL.
There were only pieces breaking up.It remains colorful,looking modern and recognizable.
One can clearly see it was ancient.The ancient look is not the result of a missile hit.
That very concept is plainly ridiculous.
No.Time order is relevant when you consider each era independently.For instance Winhill era is 1572 for example.Like you said before the time order is irrelevant because the WOTC mixed up all time line from each area.
Nothing can be said about the exact dates of the other eras.