This 19th century Thorn Island fortress near Pembroke, Pembrokeshire is an amazing space, as well as a grade II listed building, which obviously limits the scope of change.
Thorn Island dates back to between 1852 and 1854, when it was constructed from local stone as an outer defence
to Milford Haven, which was then a large naval base.
If you like the idea of your own kingdom, Knight Frank has this up at £550,000 — via WowHaus
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