Arcadia (city)

Arcadia was, according to the Eleventh Doctor, "Gallifrey's second city". (TV: The Day of the Doctor)

The First Doctor once planned to live in Arcadia with Susan Foreman. He and Susan performed a ritual with a group of rebelious Prydonians. The Master was also present at the ritual. (AUDIO: The Toy)

Narvin dined in the palace of Arcadia with a delegation of Sunari. (AUDIO: Intervention Earth)

During the Last Great Time War, it was thought to be "the safest place on Gallifrey", protected by 400 sky trenches. Nevertheless, Dalek forces managed to breach these supposedly impregnable defences on the last day of the War, and proceeded to invade the city. While one alone was enough to lay waste to Arcadia, countless others descended to destroy everything and sent Arcadia's residents fleeing for their lives, with soldiers desperately trying to fight off the enormous fleet in a losing battle. This led to the fall of the city, which was depicted in a painting. The War Doctor was present; extremely weary by this point in his life from combat, loss and suffering, he chose this location to serve notice to both Daleks and Time Lords alike that he was going to end the Time War today. (TV: The Last Day, The Day of the Doctor) He intended to do this by obliterating all combatants in the Time War. (TV: Dalek)

During the Fall of Arcadia, the War Doctor borrowed the gun of a Time Lord soldier to blast the message to both Daleks and Time Lords on a wall — "No more". Once the message was completed, he flew his TARDIS through a wall and into a group of Daleks before fleeing the city. (TV: The Day of the Doctor) Bowships were used in the battle, but failed to prevent the city's fall. (PROSE: A Prologue)

The Moment showed the War Doctor, Tenth Doctor, Eleventh Doctor, and Clara Oswald the ruined state Arcadia had been left in by the Time War. Among these images were innocent civilians fleeing in terror as Arcadia was torn apart by the Daleks and the Time Lords. This was a deliberate choice so the Doctors and Clara would understand the ultimate consequences of destroying Gallifrey. This helped convince them to find a more peaceful solution to end the war. (TV: The Day of the Doctor)

The Tenth Doctor later mentioned that he was present at the Fall of Arcadia, and that he still hadn't recovered from it. He hoped one day to come to terms with it. (TV: Doomsday)