One mod i really like, as i already told to Stirby, is the conquest reforged
But i know not everyone may like it
Because it's a mod that is also a texture pack. It makes the textures like pic related, but it adds shit-ton billions of ancient style construction blocks, there are blocks to build ancient stuff like viking villages or celtic villages, but most of all blocks to build medieval style castles in a very realistic way. You should check the following videos:
Celtic village (imagine this with stirby's boats):
https://youtu.be/Px1_M3j0mL4?si=yOkwTt8Tfk_S3v-NAnd medieval castle (polly must check):
https://youtu.be/14uvTkJiTD4?si=49-N19M88zaC5o1g 