Plas Mawr Things Plas Mawr is an Elizabethan merchant’s house in Conwy, North Wales. I’m not a big fan of visiting old houses but I’ve been back to this place many times since my first visit 25 years ago. I love the old skool psychedelia. Share this:FacebookTwitterPinterestMoreEmailLinkedInRedditTumblrWhatsAppLike this:Like Loading...