In recent years, I have visited many of the museums in Manhattan. I started with the largest and most popular ones, and quickly have determined that photos don’t do many of these fine works of art any justice; you need to see them up close. See works by Salvador Dali or Van Gogh at MOMA.
To get more ideas for museums, I went to the yearly CultureFest held in Battery Park City, NYC. There are many smaller museums which serve some niche interests which this festival highlights along with some performance art that is scheduled thoughout the day. It is worth a visit if you have the opportunity, Battery Park is beautiful and a great place to host a festival. It is at the CultureFest where I learned that there is a Museum of Finance (or as I like the call it, the Money Museum) located where else but on Wall Street. This is worth a visit, too, but make sure you plan other activities. It won’t fill up your day in the same way the CultureFest or MOMA would. I recently visited this museum.