Mountains
Skirrid
When we hiked up the Sugarloaf on my first evening there I was amazed at how the sheep just ignore you as you walk past. From the mountain you can see all of Abergavenny. The town is surrounded by mountains and looks a right quiet town from that far up.
The Skirrid has this amazing twisting path to the top. There are a lot of what seem to be secret places to investigate and wander as you walk up.