The four turreted gateways furnish excellent examples of 6th and 17th century architecture.
Outside the turreted rampart are a ditch and covered way.
Its wards, in which nearly ten thousand patients receive treatment annually, are lodged in a series of turreted pavilions, and cover a large space of ground on the margin of the Meadows, from which, to make room for it, George Watson's College - the most important of the Merchant Company schools - was removed to a site farther west, while the Sick Children's hospital was moved to the southern side of the Meadows.
The Rectory Tower, a turreted gate-house of brick, dates from c. 1495.
A strong machicolated and turreted wall surrounds the rock, running along its base on the south, ascending halfway up the cliff on the north, on which side it stands close to the abbey wall, and again descending on the west.