This beautiful little castle is located in Berwick-Upon-Tweed, Northumberland, on a tidal island called Holy island. Visitors are required to look up safe crossing time using the online tide table, in order to avoid being stranded.
If you, like me, are fans of the TV series Vikings, you might notice that this is the location from where the charismatic Viking, Ragnar Lothbrok had abducted his slave (later friend) Athelstan. Although this castle was built long after the fabled abduction, in the 16th Century.
There are usually sunbathing seals to be seen on the beaches around the castle, also plenty of sea birds to be observed.