RE: Younghwasa Temple in Acha mountain
A continuation of your meditation on changes, @slowwalker.
In this case, the city boundaries of Seoul change over time and so much so that the choice of a fortified location becomes irrelevant as the city expands.
I think this is symbolized in the temple - they're usually located in a remote location on a mountain, but in this instance, the city has come to the mountain.
In a final irony, the temple precincts become a congested parking lot for cars.
They say time is the longest distance between two places but judging by Seoul's expansion over the years, the opposite seems true.
Have a good day, my friend.