St Ann's Fort. This open square and the brick arched wall to the north are the last traces of the gun battery known as Saint Ann's Fort. Built in 1570 it was repaired and re-gunned against various seaborne threats to the town, 1625-1815. St Annes Street, King's Lynn 1 Jan 2005 by Rotary Club of Kings Lynn Trinity in 2005 Colour: green Wikimedia: Flickr: Google Streetview OpenStreetMap