I have fanatically spent the last year thoroughly studying EVERY COUNTRY in the world to find the correct building. I’ve used every resource available on the internet to find and verify the tallest building in every country, with the most accurate height available. These are all buildings, NOT observation towers. I chose the CTBUH definition of a building as a structure in which 50% is occupiable, so this includes mosques and cathedrals. The buildings in this list are completed or very close to completion. I used the list of sovereign countries on wikipedia. I did allow the UK to be treated as four countries, England, Wales, Scotland, and Northern Ireland. Enjoy this labor of love!