In the UK many of these would come under the heading of "blue plaques". If you follow wikipedia through on this topic it talks about "historical marker" in the first sentence so people wishing to map these features may well search for this on the OSM wiki. historic=marker would there for seem to be a reasonable tag in this context.
Dudley > Date: Tue, 30 Apr 2013 20:38:26 -0700 > From: [email protected] > To: [email protected] > Subject: [Tagging] Feature Proposal - RFC - historic=marker > > Perhaps tagging this as "tourism=historicmarker" would be a better > option. Thoughts? > > _______________________________________________ > Tagging mailing list > [email protected] > http://lists.openstreetmap.org/listinfo/tagging
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