Dave Hitchborne on Geograph Portcullis Gate 1574-77 Built after the long siege of 1571-3 as the main gateway into the castle, it stands on the site of the medieval constable's tower. The top storey was added in 1887. , Edinburgh #04 of the Edinburgh Castle series Colour: This plaque is purple, white and green glass claret orange purple clear bronze grey stone red slate wood blue black brass multicoloured pink brushed metal green maroon film cell green and red Belgian Blue Stone red and black yellow terracotta marble brown silver white gold Wikimedia: Flickr: Google Streetview OpenStreetMap