eastern on book tv, author don blago discusses his book, "grand canyon: a history." of a way into the grand canyon, about 70 miles east of here and then another 200 miles to the west. is where the canyon for starts to widen and deepen and turn into the classic views that you see and most photographs, calendars, or famous images. at 2:00 p.m. eastern on american history to become a visit to the lowell observatory to hear about astronomical discoveries including the discovery of pluto and new mapping for the apollo program. and then a tour of a special national monument. >> many might think of this site isabandoned and empty but it still a living site for a lot of the descendents of the ancestral pueblo people that live in the area. people might come here to do ceremonies and pay homage to their descendents. -- to their ancestors. this is still a very important site for many people in the southwest. tour of c-span's city flagstaff, arizona today at 7:00 book tvon c-span two's and sunday on american history tv on c-span3. working with our cable affiliates as we explore