It is usually interpreted as an aspiration of refinement and culture, but it is important to observe the condition of the museum. Many authors believe that if the museum looks good its an omen of an improvement in our situation that will come as a result of studies made in the past, or as a family heirloom. But if the museum is in ruins, it indicates pessimism and despair in our current situation.
Dream dictionary: Museum dream meanings
Dreaming of being inside a museum means that the dreamer will have to go through difficult situations and experiences, before achieving whatever is desired. If the museum is half empty, unattended, then the chances of success are lower.
Dreaming of a museum, denotes you will pass through many and varied scenes in striving for what appears your rightful position. You will acquire useful knowledge, which will stand you in better light than if you had pursued the usual course to learning. If the museum is distasteful, you will have many causes for vexation.
…Museum usually symbolizes or reveals a person of high level of culture and the capacity to enjoy the little pleasures in life. The richer and better stocked the museum the better the omen of wealth and well-being will be. If it’s abandoned and dusty museum, it is a sign of warning which reveals a state of hopelessness and pessimism….