Reddit mentions of Himeji Castle: Japan's Samurai Past (Castles, Palaces & Tombs)

I also remembered that there is r/asklibrarians but you should definitely ask your local librarians. This is the kind of thing they live for!

I had some time this morning so I went through our history books and found as many as I could that are good for general reference so they should hit all those subjects for her in a broad but informative way. Since that's my son's favorite subject, and he is homeschooled, we keep a lot of historical encyclopedias around:

Everything You Need To Know To Ace World History

Everything You Need To Know To Ace American History

World War II: The Definitive Visual Guide

The Usborne Internet-Linked Encyclopedia of World History

Free: U. S. History Sourcebook - Basic Kindle Edition

Also Free: U. S. History Sourcebook - Advanced Kindle Edition

The Kingfisher History Encyclopedia there is probably a newer version now of this. This is my son's FAVORITE throughout the years.

History: From the Dawn of Civilization to the Present Day

This is a good one too: Himeji Castle: Japan's Samurai Past

Since your daughter is interested in Japanese history as well, I asked my son's Japanese teacher what she would recommend (she has the kids read books periodically), and she recommended some books. I know they're not all nonfiction, but historical fiction can give a lot of context and understanding.

The Cat Who Went to Heaven – Elizabeth Coatsworth

The Samurai’s Tale – Erik C. Heaugaard

Born in the Year of Courage – Emily Crofford

The Big Wave – Pearl S. Buck

The Master Puppeteer – Katherine Patterson

The Sign of the Chrysanthemum – Katherine Patterson

Sadako and the Thousand Paper Cranes – Eleanor Coerr

Heart of a Samurai – Margi Preus

If you're after cheap books and can't find them at the library, search on abebooks.com or the used books on amazon.com. We always check Abebooks first because they're almost always cheaper there once you factor in shipping.