In my opinion, macro photography is perhaps the most difficult. You need special equipment, lens, setting, etc, in order to succeed.
This is a tiny wild flower I found in my garden. It is probably about 8mm across only. On a closer look, this flower is indeed beautiful! To find out more, go to my photography blog on how to take macro photo which I learn recently.
Don't forget to click on the image above to see a larger image.