Heureka is situated in the Helsinki Metropolitan area. Every year, on average, 300.000 visitors come to Heureka; it is one of the largest year-round attractions in the area. 20–25% of the visitors are school classes. Heureka has a main exhibition including Children’s Heureka and also always houses two temporary exhibitions. Special activities supplement the exhibitions: The Verne Theatre, Children’s Laboratory, The Open Laboratory, Science Theatre Minerva and the Basketball Rats.