old haunts; former home; old nest
Refers to a place one used to frequent or live in, often with nostalgic or figurative overtones. Can be used for a former workplace, team, or group.
He returned to his old team after a long time.
The retired player visited his old home stadium.
He returned to his old team after ten years.
The player ended up facing his former team.
Compound of 古 (old) and 巣 (nest), literally 'old nest'. The figurative extension to familiar places or groups is natural from the nest metaphor.
She decided to leave the company she had worked at for years.