Horcrux locations, whittling down the list

[Jen Reese]

No: HPFGUIDX 137608

Dumbledore tells Harry in the Horcrux chapter: "I have traveled 
widely, visiting those places he once knew. I stumbled across the 
ring hidden in the ruin of the Gaunts' house...He hid it....never 
guessing that I might one day take the trouble to visit the ruin, or 
that I might be keeping an eye open for traces of magical 
concealment." (p. 504, US).

I'm making a guess here that Dumbledore also visited the Riddle 
House/graveyard at the same time, looking for 'magical concealment' 
and found none. The orphange too, I think, because not finding signs 
of concealment at the orphanage probably led Dumbledore to remember 
the cave, a site where Riddle probably performed somewhat complex 
magic for his age. Mrs. Cole was likely dead, but Amy Benson and/or 
Dennis Bishop might have been convinced to tell the location of the 
cave to Dumbledore.

So say the Riddle House and the orphanage are out, and the Gaunt 
House provided the ring, but offers no more clues. 

Our knowledge of other possibilities is slim, as Dumbledore 
said, "If it was difficult to find evidence about the boy Riddle, it 
has been almost impossible to find anyone prepared to reminisce 
about the man Voldemort. In fact, I doubt whether a soul 
alive....could give us a full account of his life since he left 
Hogwarts." (chap. 20, p. 430, US):

What are there now, two more Horcruxes to find?  That's assuming the 
locket at 12GP is a Horcrux, and Nagini as well. So, two down, two 
located but not destroyed, and two missing.

1) Hogwarts--very likely, given the significance to Riddle.
2) Borgin and Burkes--maybe. Would have to be concealed pretty well 
not to get sold!
3) Azkaban--It might be interesting for Harry to see Azkaban before 
the series is over. A Horcrux would be well-proteced there. Possible.
4) Godric's Hollow--unlikely (in my mind). The only significance to 
Voldemort was Harry; he would not hide a Horcrux at GH before the 
night he went to kill the Potters. I'm not a Harry-as-Horcrux 
believer. ;)
5) Hepzibah Smith's house--No. Not safe enough, not significant 
enough.

Those are the only places we really know Voldemort visited or had 
significance to him. Somewhere in Albania is possible, or 
aussie/justcarol mentioned Durmstrang in post #137605 as I'm writing 
this. But Harry is running out of time and pages, so that might be a 
time-consuming diversion.

Jen, wondering if Harry will be able to learn the art of noticing 
magical concealment or if someone will do it for him?