Geograph - photograph every grid square

Edinburgh Castle contains buildings from the C12th to the C20th centuries with the majority dating from the C16th and C19th. The oldest part of the castle is St Margaret's Chapel which was built by King David I in the early C12th, dedicating it to his mother who had died in 1093.
The castle was the seat of the Kings and Queens of Scotland from David I to James VI in 1603 when the crowns of Scotland and England were combined on Elizabeth I's death, James becoming James I of England.
The "Lang Siege" Link of 1571-73 ended with the bombardment of the Castle and the destruction of both David's Tower and the Constable's Tower. Much rebuilding followed and a large amount of the castle dates from this time.
This was followed by considerable building in the C17th, C18th and C19th see a good wikipedia article on the castle here Link
One of the most recent buildings on the site is the Scottish National War Memorial which dates from 1927 but is built in a baronial style that means it blends well with the rest of the buildings.
The castle is built on top of an ancient extinct volcano so is elevated above the rest of the city, though not as high as nearby Arthur's Seat.