From 2015, a set of four maximum cards, each with a different historical building.  We have to hand it to Macau:  though the city is nearly unrecognisable from just a few years ago, much of the development has concentrated in specific areas, and the historical buildings have generally been nicely preserved–befitting a UNESCO Heritage location.  These cards bear Macau Post’s reference numbers BPL 183-186.  Unused.  Grade: 1