Recently, a brand new 'world's largest lego tower' was built in Sao Paulo, Brazil. See it here, it's amazing:
Almost 6,000 lego lovers came together in Sao Paulo to build the world's largest lego tower. They put together nearly 500,000 lego pieces over four days and the result was a staggering 102 feet and 3 inch tower.
Lego towers were built in many countries all over the world since the first one which was built in London in 1988. Last year, Chile was holding the title.