Below are indexes of archival material spanning the US and Europe. Keyword searching is a good place to start, but also pay attention to the metadata at the left hand sides of the pages. Keywords might include honeymoons, roads, mountaineering, Fred Harvey, women explorers, Black tourism, or any search curiousities you may have.
Digital Public Library of America
The Digital Public Library of America has the goal of bringing together the riches of America’s libraries, archives, museums, and cultural heritage sites, and making them freely available to students, teachers, researchers, and the general public.
At Europeana is an online repository of thousands items from European archives, libraries and museums. Europeana provides access to millions of books, music, artworks and more – with sophisticated search and filter tools to help you find what you’re looking for.