There is no clear answer in that question beacause all the museums have their importance.If i have to pick one that would be Uffizi Gallery!
World Museum was created in 1853.
It has a great Maritime Museum and one of the world's best Auto museums.
World Rugby Museum was created in 1996.
Museum of World Treasures was created in 2001.
Museum of World Religions was created in 2001.
Circus World Museum was created in 1884.
Natural World Museum was created in 2001.
Museum of World Culture was created in 2004.
Natural World Museum ended in 2009.
London museum
Ashmolean museum in Oxford
Circus World Museum is in Baraboo, Wisconsin.