Billed as the world's first 24-hour art gallery, Celle's sexy cubed Kunstmuseum, housing the Robert Simon Collection, isn't actually open around the clock. Rather, during regular opening hours, you can admire the indoor collection of modern art, including the focal point 'Light Room' by Otto Piene. As night descends, the ‘nocturnal museum’ glows and oozes different colours as the actual building morphs into an artwork to be observed, with light and a few sounds.
