There are various debates about what counts towards the official height of a building, namely whether you can include radio masks, spires or whatever. Suffice to say that the precise details are way too tedious to get into. When we were in Chicago earlier, we went to the Sears Tower, which used to be the highest building in the World (see ). Then there's the Calgary Tower (see ), which claims to be the highest, but that actually its height above sea level, not the height of the tower itself. As I've said previously, we're covering a lot of towers on this holiday. The CN (short for Canada National) Tower, in Toronto is actually the tallest, but it only qualifies as the highest “free-standing structure" in the world. Even then, there are actually taller structures as
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