Dmitry
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I visited Van Nelle factory on a tour. The building is a UNESCO heritage site, famous for its beautiful modern architecture. It is a bit obscure and off the beaten track as a tourist destination but definitely worth a visit if you are an achitecture/art fan. There is a nice view from the top floor on the surroundings, with Rotterdam skyscrapers in the distance. To my knowledge, it is open for tours only on week ends. English language tour was excellent, highly informative and brought the building to life. It should be booked in advance online. The factory is accessible from Rotterdam central by taxi ride (probably there is also a public transportation option but i am not sure).