{adj} interesting 是指你對一件事/物旳感覺
e.g.:This book is very interesting.
or
He is such an interesting person.
而 {adj) interestd 則是表達你自己的感覺
e.g.:I'm interested in History/(something).
P.S.If you want to change ''interested'' into ''interesting'',it should be:
History is very interesting.