The castle stands precipitously above a loop of the
River North Esk, which protects it on three sides. This rocky promontory was breached on the north side to form a ditch giving further protection. The castle is approached from Roslin across this ditch, via a precipitous bridge and through the ruined gatehouse.
Ruins The remains of the gatehouse and north range comprise only fragments of walls and one side of the entrance arch, with the remains of a
bartizan above. Along the west side of the castle, the 15th-century curtain wall remains standing to a considerable height. This section of wall has six openings at the base, one of which served as a
postern gate. On the outer face, the six bays are divided by rounded
buttresses. Old sketches of Roslin show bartizans above each of these buttresses, with a wall-walk connecting them. To the south of this wall is the remaining wall of the keep. The mound beneath is formed from the collapsed remnants of the other three walls. The ruin suggests that the keep was around 16m by 12m, with walls 2.9m thick rising to a
machicolated parapet.
East range The restored east range measures around 31m by 10m, with a pitched roof and crow-step gables. It is entered through a richly carved doorway, dated 1622 and initialled SWS for Sir William Sinclair, which gives access to the third floor. The three lower floors are cut into the rock, and each has four vaulted rooms, with a fifth in the south-east tower. These lower levels were used for service rooms, with the principal rooms in the two upper floors. At the lowest level was a kitchen, with a bakehouse above. On the exterior, gunloops are found on the south wall, with several shot-holes on the east. All five floors are connected by a central scale-and-platt staircase, added in the early 17th century to replace a
turnpike stair in the south-west. The rooms of the upper floors have impressive panelling and decorated ceilings. The main hall, in the south part of the block, has been divided, but retains a large fireplace with the carved initials WS and JE, for William Sinclair and his wife Jean Edmonstone, and the date 1597. ==Popular culture==