What's the tallest building you've ever been to the top of? Did you ride the elevator or take the stairs the whole way? Was there anything interesting at the top (dining room, etc)?
It was as part of a geography A level field trip back in 1997. It had only just been built and the top floor, the 50th was empty - not even partition walls in.
We took the lift up and apparently it was unusually at the time to have a single lift that went all to fifty floors.
It was a grey rainy day, but there was still a good view down to the Millennium Dome (now called the O2 Arena) which was under construction.