Rough's Tower is an extraordinary monument from WWII, during which it was apparently created to defend the port of Harwich. Since then, it has been passed through various hands and is currently a self-declared Principality of Sealand. The wikipedia link says it all, really...
Anyhow, several miles off the Suffolk Coast, this makes a good target for a sail in benign conditions!
Following Rough's Tower, I thought I'd take in another tower - this time the Naze Tower. En route, I had to dodge the Cork Sands which explains the rather strange track below.
Photographing this tower was rather trickier, given the general haziness of the day, so this link should provide a better idea of what its about. This splendid octagonal structure was built in the 18th century as a marker for ships - before lighthouses were invented, one imagines.