One thing we learned about Wales was there is a lot of castles. Most of them are in ruins because they were created to defend against the invading forces (England). As England took over an area they destroyed the castles. Its a bit of a shame, but my kids love climbing over castle ruins rather than touring fancy castle museums.
The castle we found was Coity Castle. As you see all signs are written in both English and Welsh. Ironically hardly anyone speaks Welsh, but the government is trying to bring back the almost dead language...thus the signs.
The castle was located in the middle of a neighborhood. There was local boys were playing soccer in the courtyard, and there was a nearby playground.