Many thanks Beachlife.
Like John says in the last 23 years I've also driven past it many times on the back road to GA and never even realised what it was.
If you look at Google Maps the arch in the bottom left of the photo is still there on the corner of Tabarca/ Armada Español.
Weird they've named a street after the Spanish Armada - you'd have thought they'd have wanted to forget about Drake, 1588 and all that.