1. Located in Bangor with a magical feel, is Penrhyn Castle. It's medieval stature can be seen from the A55 driving towards Anglesey tempting you with it's beauty, especially in Autumn with it's red ivy climbing the walls.
With plenty to see including the manor house itself, a train museum, picnic gardens and it's walled garden with an exotic feel to it, it's great to know dogs are also allowed in the gardens to enjoy the National Trust site with you.
2. Raglan Castle, surrounded by its beautiful moat, is located in Monmouthshire. We visited on a warm summers day and with it's tower to climb, the views of it's surrounding countryside can be seen for miles. Again, dogs are welcome, there are interactive points around the castle for children and plenty of the ruin to leave you imagining the castle all in its glory.
3. On what MUST have been the coldest day of the year, we visited Chirk Castle, near Wrexham. There's lots to explore on the site with acres of land to walk in, events which are particularly good near christmas time (including dinner with santa in one of its magnificent rooms) and what looks like a secret garden which we are yet to explore as dogs weren't allowed but look forward to visiting soon.
Let me know of your favourite castles so that I can visit!