This souterrain was built into the outer rampart of Castle Law fort, close to the entrance, and was excavated by Childe. It has been recovered with a concrete roof to protect it, which at the same time allows you to get a real feel for what a souterrain was like.
The main passage is about 21m in length, running approximately N to S with a curve to the SSW, and widens from around 0.90m at the entrance to around 1.60m at the S end, where there is a slightly rounded terminal. The wall also increases in height from around 1.30m at the entrance to 1.70m at the terminal.
About halfway along the passage there is a low entrance to a round chamber on the W, which measures around 1.60m in diameter and 1.95m in height.
Built into the top of the E wall of the terminal is a cup-marked rock, with approximately five cups (two of which are oval) measuring up to 50mm in diameter and around 12mm deep.
Alternative names for Castle Law
Weather at Castle Law
max 13°C / min 11°C
Weather observed at Penicuik at 10:20