Castlegate
At the upper end of Castlegate stands The Salvation Army Citadel, an effective castellated mansion, on the site of the medieval Aberdeen Castle. In front of it is the Mercat Cross, built in 1686 by John Montgomery, a native architect. This open-arched structure, 21 ft (6 m) in diameter and 18 ft (5 m) high, comprises a large hexagonal base from the centre of which rises a shaft with a Corinthian capital, on which is the royal unicorn. The base is highly decorated, including medallions illustrating Scottish monarchs from James I to James VII. To the east of Castle Street were the military barracks, which were demolished in 1965 and replaced with two tower blocks.
Read more about this topic: Architecture Of Aberdeen