lets say we are making a bucket list of the top 20 things / landmarks / bridges / natural things even (whit cliffs of dover for example) that we must see
Tintagel, the open air theatre in Cornwall.
If you like castles and ruins you could go to Glastonbury,Dunster or Totnes. I loveTotnes. The " castle" isn't much to see, but the town and surrounding are lovely. [please excuse mistakes in writing. Ipad playing up]
We have some beautiful castles here in Wales, and its difficult to pick a favourite Carreg Cennanbut is always popular when I take visiters from abroad there :::