Castelo de Sao Jorge, Lisboa

Now if the English, somehow, had invaded Portugal and managed to stay there (that's just an imaginary hypothesis for the sake of the argument), this lovely castle which looms over the hilly city of Lisboa would be covered with wires. The internal defense walls as well as the very rare barriers where such walls are lacking, are all below knee-length. It's great to be walking up there, but it's quite likely a couple of tourists break a leg every year or so. British health and Safety legislation would surely have erected vast metalic frames to prevent such hazards...