Take your team for a walk across the top of one of London’s most famous landmarks. Up at The O2 is an outdoor walkway that spans the arena’s entire domed roof. Up takes two hours to complete and, at the top, offers 360-degree views of the city skyline. If the prospect of this induces a bout of vertigo, you’ll be comforted by the fact that all participants are safely harnessed in. A ‘climb movie’ is made during the event, to be taken home as a souvenir. The attraction benefits from transport links via North Greenwich tube station and the nearby Thames Clipper pier – a fun way to arrive.