please empty your brain below

I'm not sure what the criteria for these buildings is, but the CN Tower in Toronto is the world's tallest free standing structure / building at the moment at 553 m.

The record will fall again with Liebeskind's Liberty Tower in New York at 1,776 feet / 582 metres, if they build it.

There's a lot of debate out there about what's a building and what's a structure. I was going to put 'tallest inhabited building', but that would have caused problems including the pyramids...

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