I am speculating here that this is a market square in the first place - it may not have been.
Notice that the square is not rectilinear - it tapers down going away from us, to the point that a single building fills the far end of the square. My guess would be that this is the city hall.
The photograph was obviously taken from the top of the cathedral spire and provides a fine view of the lovely countryside beyond the town.
Ypres was the site of one of the fiercest and most protracted battles of World War I. I believe that nearly a million men died in the battle that carries the name of this ill-fated town. It is unlikely that any of the buildings in this scene survived more than another 20 years. Belgium has never really recovered from the two world wars.
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