The Times Digital Archive (London, England) is available from 1785-1985. It offers full facsimile images of either a specific article or a complete page. The complete newspaper is available, including all articles, advertisements and illustrations/photos. Search results can be limited by section or date.
"...has consistently delivered a highly intelligent and comprehensive report of the week's events and has long been a leading magazine for business and political leaders, politicians, diplomats, bankers, journalists, and other influential people throughout the world. ... They provide a unique, unbiased analysis of major world events, facilitate the comparison of economic trends across continents and centuries, and offer an ideal historical resource for cutting-edge ideas in an easily digestible form."
The Historical Guardian (1821-2003) and the Historical Observer (1791-2003) each offer full-page and article images with searchable full text back to their first issues. The collection includes digital reproductions, providing access to every page from every available issue.