Pleasure palaces from a turbulent past, “Dark Pools: Historic Swimming Pools of Berlin” dives into 100 years of German history as seen through the city’s elaborately designed swimming pools. In a nation that idolised its swimmers, its pools were often built to high standards, with styles ranging from Roman bath to minimalist Bauhaus. Striking photos of the site of the infamous Nazi Olympics show the pool still in use and looking much as it did in 1936.