She mentions it in the opening moments of Vincent and the Doctor when she is listing all of the places the Doctor has taken her (following the events of Cold Blood where Rory was killed and absorbed into the crack). Now, whilst Arcadia could be the name of any thousand different colonies or planets, it is quite strange that this wasn't elaborated following on from the events of The Last Day, where Arcadia 'the safest place on Gallifrey' fell to the Daleks.
There's no way Amy and the Doctor could have visited this Arcadia between Cold Blood and Vincent and the Doctor...
... Or is there?
Thoughts below
There's no way Amy and the Doctor could have visited this Arcadia between Cold Blood and Vincent and the Doctor...
... Or is there?
Thoughts below
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