The Siege of Volganoff was originally displayed as the Siege of Altdorf at Games Day 2010 and was then put into place at Warhammer World in 2015. A few years later it was reduced in size. The Chaos forces were replaced with Orcs and the the “new” diorama was entitled the Siege of Volganoff.
The diorama has changed quite a bit over the years. More photographs of the Siege of Volganoff.