Open to visitorsa Historic Environment Scotland site — many are free to wander; staffed ones charge and keep set hours
Earthworks onlybanks, ditches and platforms — read the ground, not walls
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Castlelaw Fort is a souterrain in Midlothian. It is the only souterrain the Albion Guide charts in the county. The site is in the care of Historic Environment Scotland.
The nearest other souterrain is Rullion Green, 1.8 km to the south. The nearest railway station is Kingsknowe, 6.6 km to the north.