Eden-DAoC

You can cast singel target and aoe spells through some of the doors on keeps and towers if you have an enemy in target. You can also cast pbae spells and hit players on the other side of the door or use GTAE spells like TWF through doors.

The doors I found having this issue:
Keeps: Gatehouse doors and lord room postern door
Towers: Oil level postern door

Video from test:
https://www.youtube.com/watch?v=mCUd0pwCYKI