Little Lamplight

 is a settlement in Fallout 3.

consists of a group of shacks set up inside a cave, lit by a system of lamps. It is inhabited only by children, who made their own society in there based on the cultivation and trade of the radiation-absorbing fungus that grows in the cave. Upon their 18th birthday, the inhabitants must leave Little Lamplight, with no exceptions. They refer to adults as "Mungos".

To go through the cavern you have to speak with Mayor MacCready and finish the quest Rescue From Paradise given from him.

The mayor of the town Mayor MacCready, will give you a quest to save three of his friend wich were captured by slavers at Paradise Falls. To get this quest you have to get to the Rescue From Paradise quest.

Don't forget that you can't kill him to get through. It's beacause Fallout 3 won't allow you to kill children. In my opinion, that's a fair rule.

Apperances
 only appears in Fallout 3.