There are a number of different reasons for maintaining an historical record with photographs. Some of them are: To see if the asset has deteriorated or in any other way changed over time (such as moved, sunk, twisted, etc.), In Construction, to determine accurately where things are located (such as where the sewer line was actually run), or to document the particulars of construction (was there re-bar in place when they poured the footer) and use a good camera while clicking the photographs. Always complete the job by building a document, catalog, printing a scrapbook and publicizing its existence. Large organizations are starting to have thousands of photographs that are un-cataloged, undocumented and impossible to find and use.