Where are all the treaties kept at from the past, in vaults, etc and who has access to them - ex: Queen Eliz.?

Answer 1

The originals will be kept in some government archive. As a citizen, you have access to any treaties your government has entered into. If you want to see the original, signed copy, you should probably contact your country's national archive and ask about the procedure for being granted access to those documents. I suspect that older treaties require a pretty good explanation before the archivist will risk exposing it to the light of day.

Answer 2

What? Treaties between which countries? What does Her Majesty have to do with it? Usually important documents like that are kept in government libraries.