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When I am sightseeing, I love it when signs actually say a great deal. It is much easier to take a photo of them on site than it is to gather brochures and literature to add to one’s excess baggage (I always end up with excess baggage *sob*!) Thus the information is handily packaged together with one’s actual pictures of the scenes.
I have found that the UK seems far better than South Africa at providing informative signs. National Trust and English Heritage do a particularly good job of it, but even tiny places of interest often have excellent ones. Here are some sets of examples; the signs followed by one of my photos of the actual place: