AIM25 is a major aggregation website that collects descriptions of archives held in the London area from more than 130 educational, scientific and other organisations and attracts more than a million hits a month. Contributing institutions include the Royal Institution, Royal Society and Wellcome Library. A recent project has highlighted the value of using Linked Open Data to improve access to these valuable collections still further. The project also highlights the potential value of Linked Data to map datasets relating to the history of science and combine information about people, places and subjects. This talk will describe the AIM25 experience and summarise some of the important work being carried out in this area.