CNN's Most Beautiful Castles in Wales

(CNN) — Wales is home to more castles per square mile than anywhere on the planet, with over 600 found across this tiny, beautiful country.
Each one has its own long history, with many dating back to the medieval period.
As the third series of "The Crown" arrives on Netflix, including the investiture of the Prince of Wales at Caernarfon Castle in 1969, now is the time to explore these Welsh treasures.
From vertiginous hillside ruins to city center gems, here's our pick of the most beautiful castles in Wales to see when you travel there.