The island is called St Michael's Mount - apparently, the Archangel Michael landed there over a thousand years ago. D'ya like my house on top?
You're right - there is a tidal causeway you can cross on foot but when the tide is out, you can catch an amphibious tractor.
Here's another picture.....
This one is the Crowns Section of Botallack Mine - a classic, abandoned Cornish tin mine. Nearly, two hundred years ago, the miners who were working 1/2 mile under the ocean, broke through causing the whole mine to flood. Incredibly, the breach was soon repaired - a task that I doubt very much could be repeated with such ease with today's technology.
