So, on my recent trip to France I was hunting for postcards, and I saw this, at which point I turned into a little spoilt brat and began begging my friends: "Please! Please! Can we go? Can we? PLEEEEEAAAAASSE!!!!??!?!" So we went, and it was a great day out.
The ruins in question are the Tours de Merle, a 13th century citadel that played a role in the 100 Years War but were gradually abandoned after its strategic significance waned.