Floating swimming pools seem to be becoming a thing. Last year we looked at the +Pool concept to install just this sort of thing on one of New York's rivers - a concept that engineering consultancy Arup has since greenlit from a feasibility point of view, at least. And then there's realities:united's scheme for the world's longest swimming pool, called Flussbad, in the River Spree in Berlin. But now the 120-meter (394-feet) long Badboot Lido has seemingly leapfrogged the competition, opening for business this August in Antwerp, Belgium. Because the Badboot is adapted from a 1960s ferry, it can be moved around the city as needed.