In this paper we describe the development of an augmented reality system designed to provide an exciting new way for the Natural History Museum in London to present evolutionary history to their visitors. In 2008 the Museum was in the process of building a new lecture theatre space called the Attenborough Studio and the BBC was asked to collaborate both with content and technology for this new space. This paper describes the work to create a suitable camera tracking system for the augmented reality aspects, the overall system architecture and the practical issues encountered. The system we developed uses a through-the-lens tracker and infra-red LED markers to provide an unobtrusive and robust system that can operate for multiple users across a wide area. This an extended version of a paper of the same title presented as a poster at the International Symposium on Mixed and Augmented Reality (ISMAR 2011), Basel, 26-29th October 2011 and published in the Proceedings of ISMAR 2011, p249-250 (ISBN: 978-1-4577-7/10).