...looking for novels I might want to read, and found this:
When Three British Boys Traveled to Medieval England (Or Did They?)
http://blogs.smithsonianmag.com/history/2011/07/when-three-british-boys-traveled-to-medieval-england/ Yeah. Apparently "retrocognition" studies are a thing.
Mostly I'm amused by the fact that as I was reading along, I thought, "yeah, no, there wouldn't have been glass windows to peer through!" and the author says more or less the same thing. (Because, of course, *that's* what proves that this didn't happen.)