Horcrux locations, whittling down the list

[vmonte]

No: HPFGUIDX 137647

Lorel wrote:

Has anyone previously considered the way the cave was so protected
and thought of how LV may have protected the other locations? For
example, the Chamber of Secrets may yet have an unknown, protected
room, but where else in Hogwarts could LV really place a horcrux
under such powerful spells and have them remain undetected so many
years? Ditto for Borgin & Burkes, as well.

vmonte:

I would talk to the twins. It seems like they know that school inside 
out. They know all of the passageways, everything. I wonder what 
happened in the passageway that collapsed? The one the twins told 
Harry to avoid?

Vivian