From Intute.ac.uk

TimeSearch is a history search engine, designed to allow both for chance discoveries and highly focused searches for historical events.

TimeSearch allows the user to design a keyword search according to criteria such as area or theme. The search can be further refined by using the Timeline Sites facility which provides a checklist of websites which can be included or excluded from the search. For example, a user can choose whether or not to include Google, the BBC, YouTube, Flickr, and a number of educational websites, museums, libraries, and archives in the search. Search results are displayed in the form of relevant links to external websites, and related articles in the HistoryWorld website, alongside a timeline of events associated with the search term.