I have dozens of photos from inside an out, this thing is amazing. For some reason I can only post 1 photo from my iPad. Gaudi was an astounding designer. He designed the columns to resemble trees, and as trees are different, he used different stone colors to more naturally mimic nature. The stone columns are not immediately noticeably different in color, they are only slightly different in hue, but as you begin to look around you notice the subtleties of the different colors and different types of stone. There are literally so many things to see that you are overwhelmed. An architectural student could study this church for a lifetime.