Gringotts Wizarding Bank

Before one enters the bronze doors they will read this inscription "Enter, stranger, but take heed, Of what awaits the sin of greed, For those who take, but do not earn, Must pay most dearly in their turn. So if you seek beneath our floors, A treasure that was never yours, Thief, you have been warned, beware Of finding more than treasure there."
The Goblins are the main employees of Gringotts. It is the only bank in the wizarding world. There are rumors that they keep Dragons as guards from theives.