These are sites that include items from all over Europe, and tend to be a warehouse for a wide variety of sources - records, photographs, books, articles, etc. - in support of general research.

  1. Europeana    "Explore millions of items from a range of Europe's leading galleries, libraries, archives and museums. Books and manuscripts, photos and paintings, television and film, sculpture and crafts, diaries and maps, sheet music and recordings, they’re all here. No need to travel the continent, either physically or virtually".    Create a free account for wider ease of access.