The museums are also an important factor for the development of urban tourism. The wish to visit a certain museum will transform the visitors of that museum into tourists for the city where the museum is located and will offer them the possibility to visit other cultural locations. Usually, the persons visiting museums are members of superior social classes, with higher incomes, a fact which leads to higher expenses during their staying in a certain location. A recent study revealed that 3 out of 10 tourists come to London for its museums.