Located in the eastern part of Tanaris, the Caverns of Time contain various portals to different key time periods and events in Warcraft history.
The caverns act as a crossroads for the various timelines; through them one can travel back and forth across time. The Caverns of Time are home to the Brood of Nozdormu and the bronze dragonflight.
Recently, a mysterious force called the Infinite Dragonflight has begun to meddle with time--the bronze dragonflight is recruiting heroes to make sure that the events that took place in the past remain as they were.
The Culling of Stratholme is one of the timeways ("wings") accessible in the Caverns of Time. It is centered around helping Prince Arthas purge the city of Stratholme from the grain-infected populace. It is one of the first acts in Arthas' descent into madness and evil.