Family historians have a natural curiosity to know more about their origins and the context of their family's history. While many of the details will be hard to recover, there are frequently clues in photographs. A house number may appear in the background as family members pose on the front steps. A known landmark might be seen in the distance. An unknown visitor bearing a striking family resemblance could be standing right beside your own easily-identified ancestors, providing you clues. A visiting relative may prompt a five-generation photograph in the local newspaper.