When it comes to land areas, most if not all areas are already shown in photographs. There are some areas that are not photographed often because of various reasons such as Namibia. There are not enough photos of Bhutan available as well.
The Atacama Desert in Chile is not usually photographed probably because it will be hard. It should be remembered that 70% of the ocean is said to have not been photographed yet. There are still so many things in the underwater world that are left to be discovered. More equipment now makes sure that taking photos underwater can be done but there are some that cannot go beyond a certain number of feet.
With all the latest technology today, from Google Maps to drone cameras, it is almost impossible that no areas in the world have not yet photographed. But the areas that have the least photographs are one, the infamous Area 51. It is a highly-classified air base that unauthorized persons cannot enter and even take pictures. This place is so secretive that it is blurred on Google Maps.
And lastly, there might be no photo yet of the deepest part of the ocean. No cameras invented and produced today can withstand the pressure of the deep. Light cannot also penetrate it and an underwater camera needs special lighting thus taking photos of the deepest area of the ocean is not possible yet.