Also, our second post for this holiday week. Only a short response is required: the incredible Barnes Foundation collection has reopened in a new space in Philadelphia this month. This would be a great museum to visit if you cannot go to New York. Go to the site and plan ahead as tickets must be reserved ahead of time.
Founded in 1922, the Barnes was originally intended as collection to be viewed only in person in the buildings' location in the Philadelphia suburbs. The paintings, ranging from El Greco to Dali, were never permitted to be reproduced (except for one small catalog in the 1990s due to financial needs of the institution), so these paintings were to be seen only in person. A controversial relocation (that has been in process for several years) has allowed the collections to move to a beautiful new location in downtown Philadelphia, and now allows more access. (More info on the relocation here and here. )