a gumbad is one of those big dome thingies, right?
i would say it's ambiguous, and could potentially refer to either 'gumbad' or 'Ram Temple'. this is a huge point of contention, though; you can get some scope of our extant discussion on this topic at
this thread.
also, i'm assuming you meant to write a comma, not a period, after 'world'.
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if you want to clear up the ambiguity, adjust the modifier so that it's clear. for instance:
- if you mean the gumbad, write '
...of the gumbad at Ram Temple, the largest gumbad in the world'
- if you mean the temple, write '
...of the gumbad at Ram Temple, the largest temple in the world'
i don't think the modifier could refer to massacre & destruction, as 'largest
in the world' doesn't seem an appropriate phrase for an historical event. if you wanted to modify those words, you'd say something like '...the largest
in world history' instead.