What do the collections of the Museums demonstrate?

There are many types of museums all over the world. And each museum has its own special collections, according to its thematic profile. For example, historical museums demonstrate different ancient, historical or modern exhibits, things, papers, photos, etc. Nature museums show us exhibits or photos of different ancient or modern animals and birds. Museums in honor of some poet, artist, musician demonstrate different things, creative works, CDs of those great people. Everybody chooses going to any museum by his or her own interest and wish. But nevertheless, each museum is a kind of great art and wonderful life.