Op-amp (LM741) gain at high frequencies
The 741 is compensated such that it has a dominant pole around 10Hz.  If you figure its low frequency gain is about 100db, at 100kHz it only has 20db left.  It is not looking like much of an opamp at this point.  It has additional higher frequency poles.  I did a quick poll zero analysis of your circuit and found a complex pair at W=39K+/-j730k.  this is a little different than your peak but that could be model differences. If your simulator will do a poll/zero analysis it will show a complex pair around the peak you are seeing.