The ruins of Cair Paravel, finding their old weapons and a single chess piece -- god! It's so good! I grew up on the BBC television shows from the 80s/90s but they really give Caspian short shrift and it's a huge shame. As a sidenote I also spent my entire childhood convinced that 'bear meat wrapped around an apple like a dumpling' was a huge delicacy that I ought to try as soon as possible.