London's state-of-the-art 02 Arena, on Greenwich Peninsula, plays host to all kinds of entertainment, from concerts to sporting events. It's the world's largest building (if you're measuring by floor space) and - when seen from a distance - looks like a 12-year-old's birthday cake.
Just 20 minutes from Central London or 10 minutes from Stratford, the O2 is easy to reach via the Jubilee Line.
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Guide, Matt, was interested and interesting.