time to find out if this is the greatest show. 192 countries, 192 pavilions, all different, some extravagant, somejust bonkers. and maybe, just maybe, some world—changing ideas hidden amongst them. who knows? maybe it's the robot helpers delivering food, giving directions and... excuse me, i'm in charge of the security here. - please let me through. ..keeping order. maybe it's the giant displays, some of the biggest and boldest i've ever seen. is it the architecture itself, hinting at new ways that we could live and work as we motor on into the 21st century? from the great exhibition in crystal palace in london, in 1851, through paris's eiffel tower in 1889, brussels' atomium in 1958, and seattle's space needle in �*62. these world expos are meant to make a statement and leave a mark — a legacy for the host country.