BBC News - Milestones of Europe: Archive of important events in the history of the EU, including audio and video footage.
Europa Portal - The History of the European Union: A brief history, plus key events of each year from 1946 onwards.
European NAvigator (ENA) : Plotting the course of a united Europe: Provides a variety of multimedia documents about the history and institutions of a united Europe: includes photos, facsimiles, cartoons, sound and film clips, interviews, interactive maps and diagrams. (Requires Flash)
European Parliament UK Office - History of the EU: Short overview, with links to other resources, plus a guide to the division of institutions between the three cities of Brussels, Luxembourg and Strasbourg.
History of European Integration and Citizenship: Short guides to events in EU integration and the developments of the concept of EU citizenship.
Leiden University - History of European Integration: Directory of thematic links to documents and research papers.
The European Prospect: Essential selections from documents and testimonies on the history, culture and future of the European Union.
Wikipedia - History of the European Union: Online encyclopedia article.