Outside of the tower during the Battle of the Citadel

The Citadel Tower was the central tower located on the inner ring of the Citadel, serving as the (usually) seat of any galactic government. In the asari cycle, it served as the home of the Citadel Council, and remained so for the Dominion Senate that succeeded it as well. The tower is a long spire connected to the Presidium, with the Council Chambers at the very top. It was in the Council Chambers that the final battle of the Eden Prime War and Reaper War was fought. Unfortunately, like the rest of the Citadel, it was destroyed when it crashed into Eos in 2253 CE.