Black Magic Craft has some nice instructions on how to build a very nice medieval style house from dollar store foam.
Robet Spears has some instructions on builidng a burial mound in 25mm / 28mm scale. It’s the perfect thing for a horror game.
For those of us who are not made of money, here’s a video on making a relatively inexpensive Imperial Knight proxy for Warhammer 40k
I’ve always wanted to do a Romans in Britain scenario. In recent months, I’ve been picking up Romans on Ebay as I’ve found them, and soon will begin looking for Celts and Gauls.
This paper model of a section of Hadrian’s Wall might come in handy. In the scale it’s in, you’d need 79 for a Roman Mile. The model is in black and white, but a little work with watercolor and a fat brush would quickly solve that