Georg Cantor is famous for introducing transfinite numbers and set theory.
A main part of his mathematical point of view about this new type of "numbers" and this new "realm of mathematics" cannot be found in his official publications. Maybe one can find it in his unpublished manuscripts, papers and letters.
Question 1: Where are Georg Cantor's original manuscripts?
Question 2: Were some of these manuscripts lost during World War II and subsequent years?
Question 3: Are some of these manuscripts in museums or personal collections now?