In western world, museum is a key institution which establishes system of knowledge, extends and passes down western culture. Museum has become a reliable "cultural vehicle," similar to that of a school system, transmitting cultural traditions to next generations- for the good of their society. In western history, especially when tracing their cultural sources, Greek temples were considered as typical evidences. Except from taking the ruin sites as physical evidences, when the Thingvellir National Park of Iceland was accepted as a world heritage site by UNESCO in 2004, this site is another proof of the intangible heritage value that demonstrates how Icelanders use communication as a vehicle to reach democracy and globalization. Museum is also an economical vehicle. For developing and under developed countries, local community's self-awareness, creativity and commitment are increasingly important for local or regional museums. This mandate has changed the traditional museum's mission, from collecting treasures of the world toward the conservation of their own communities' cultural heritage. It is necessary to study the history of western museum systems, if we want to have a healthy museum.