Moonflower
To the right, in the sidebar, there is photo of my front door. The large white flowers turn into seed pods such as the one above. I photographed it in 2002.
This plant has many names, one of the most common being Jimson Weed. It is the same species that Georgia O'Keeffe painted during her time in New Mexico, where it grows wild. O'Keeffe also painted Morning Glory, the climber that I mention in the posting below.