Please consider one more photograph:



We see an old bridge crossing what appears to be a long-dry river bed, canyon or arroyo in a minimally inhabited area.  There are telephone or power poles scattered in the distance and there is some type of structure visible in the upper left. The bridge appears to be a single lane and the road surface leading away from the bridge appears to be dirt. There appears to be road taking off to the right just past the bridge as well. It appears to be a desert setting.

Consider the same photograph with the caption:

This single-lane bridge at Canyon Diablo, AZ, was part of an early alignment of Route 66, allowing motorists to safely cross the canyon. The highway alignment and bridge, which to this day has a gravel surface and is used daily by locals, was later replaced by a more direct route through the area, bypassing both the canyon and a popular tourist stop known as Two Guns. AZ. The attraction featured a roadhouse, automobile camp, convenience store and a small zoo with “mountain lions”. Going from Chicago to Los Angeles, Route 66 was originally cobbled together from existing roads and trails in the early 1920s. As better or more direct routes became available, the highway went through numerous realignments, especially in its early history.


Again, information provided in the caption has significantly added to the context and the understanding of the photograph.