Since you asked, Tom: pre-18th C. stoneless architecture
... can someone tell me what large or imposing human structures before the 19th century or so were NOT made of stone?
Kinda reminds you of Rohan, doesn't it?
I don't even recall how I know this... but throughout Scandinavia, Baltic Europe and the Ukraine (i.e., wherever the Vikings had trade or conquest) there were hundreds of imposing churches and cathedrals constructed of wood. Many survive.