It is worth noting that many of the authors have produced young adult novels that explore historical periods. For example; Australian historical novelist Wendy Dunn has written Light in the Labyrinth provides an interesting perspective on the live of Anne Boleyn from the perspective her niece, the 14 year old Kate Carey.
This post from the International Business Times highlights a Vatican project to digitise their manuscripts. This is a cool thing as a medieval reenactor, but it is most likely one of the largest collections of historical documents from all over the world. So it makes it a great resource for schools.
In this collection there are a range of Artworks, Illuminations & Manscripts from the 1400s onwards. Of course that are items from Itailian history, along with the Aztec, Japanese, & Herbew cultures.
The Vatican Library Digitization Project part of the Biblioteca Apostolica Vaticana aims to scan, save and distribute these slices of history and have set up a crowdfunding website to aid in this happening. And for €5 a page it’s worth it.