Today’s quiz: explain the obscure site

Can anyone tell me what is probably so famous about this site, in Essex? The bit of historical interest is next to the houseboat in the centre of the image.
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If you’re on twitter, or have read the right blogs, you know already. So no giving it away. And googling it is cheating. :-)
And bonus points will be given for explaining the rectangles.

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6 Responses to Today’s quiz: explain the obscure site

  1. Cath Ennis says:

    Is it where the krakens first came ashore?

  2. Mike Fowler says:

    I couldn’t stand the tension, so I checked your bird feeder. Awesome!

  3. Bob O'Hara says:

    Cath – that’s a crackin’ suggestion.
    Mike – it makes you want to visit with a bucket and spade to search for barnacles, doesn’t it?

  4. Mike Fowler says:

    You could send a postcard from there by courier pigeon.

  5. Suzi Gage says:

    Are you going to share the answer with us if no one gets it? :)

  6. Bob O'Hara says:

    Err, yes. Today if I get the time.