Maps of course to find one's way. But also to create a certain atmosphere, mostly ancient (f.e. middeaval or 17th century) Often these two are combined. A map designed in 17th century style but with actual information. 
A map which leads you through an exhibition, depicting at the same time some highlight of this exhibition, by this means also becoming a kind of remembrance or souvenir. Or even better a map which at the same time (or later on at home) can be played as a boardgame.