I will save you some trouble in educating your children. Don't bring them to an historical place, hoping they will develop some interest and want to learn about it. That does happen, but it is so serendipitous as to be unreliable.
Have them learn first, and then go, painful as that is for you.
We take a family trip in honor of each boy's highschool graduation -- their choice. In 1997, Jonathan chose England and Scotland. Note that Braveheart came out in 1995. Jonathan was very taken with being descended from William Wallace, and all things Scots in general. Our first two sons had grown up in a family oriented toward the medieval. We had gone to SCA events in elaborate costume, had read them dozens of stories with knights and dragons, visited Hammond Castle and the armor museum in Worcester, and made padded swords for them to engage in mock combat. I thought that the second son, Benjamin, would pick up enough history on the trip to aid him in subsequent history classes.
Fast forward four years. "How did the history test go, Ben?" Not bad. I think I got almost everything, except there was a question about Hadrian's Wall (disdainful voice) which of course only Doug knew about. My eyebrows went up, my eyes widened, and I shook in anger, remember the approximately $6K we'd spent on the trip. "You were ON IT! It's the border between Scotland and England and you and Jonathan played on it! Don't you remember?" Oh. Yeah. Sort of.
Two weeks later. Y'know, I think I'd like to see Versailles when we go on my trip.
Spend your money on the movie first, the academic lesson second, and the trip third.