Finding historical versions of web pages (mementos) captured by multiple archives across the world.
Unfortunately the Mementos service is currently unavailable. An alternative version of this service can be found at the Los Alamos National Library's Mementos Timetravel site.
A 'memento' is a historical version of a web resource. Memento is also a method that allows seamless discovery and delivery of individual mementos, regardless where they are held. This is based on metadata aggregated from various web archives in the world, allowing you to find the historical pages you need across several archives.
The history of www.webarchive.org.uk
The history of www.bl.uk