Gallifrey
The place where The Doctor was born, and also the place that got obliterated because it had no idea how to handle a war.
'Gallifrey is where The Doctor was born. It’s also where his birth certificate was lost in the explosion.'
'My friend thinks Gallifrey is the best planet ever. I told him it was destroyed because it didn’t know how to fight.'
'The Doctor’s home planet got destroyed. It was a total mess.'