IITorpantau tunnel - E portal On the mountainside within a forestry plantation almost due W of Pont Blaen-y-glyn and below the summit of Coetgae-llwyn.
IITorpantau tunnel - W portal By the mountain road near Taf Fechan Forest, N of Pentwyn reservoir and in an area of open mountain called Coetgae-llwyn.
II*Tunnel Passage at Fort Williamsburg On the northern side of the Fort linking the former Parade Ground and the Tower and beyond to the outer bastions. Fort Williamsburg is approximately 0.5km south-east of the house.