Gallifrey

Location
Gallifrey contains the Doctor's hut and the Citadel, Capitol, whatever you want to call it. Within the Capitol there are the three regeneration chalices which reverse-regenerate or set all future random incarnations to a specific gender.

The Doctor's hut has: a few boxes; a bed, a tyre and the Moment.

Beneath the Capitol is a secret...

History
The secret is the only known change to Gallifrey.