Little Lamplight

Little Lamplight is an underground cavern and pre-War tourist attraction in the Capital Wasteland It is a settlement populated entirely by children.

Background
 Originally discovered in the late 19th century, Lamplight Caverns were transformed into a tourist attraction during the 1920s. In 2066, portions of the cave were annexed by Vault-Tec for use in its Societal Preservation Program. This resulted in the construction of Vault 87.

On October 23, 2077, 82 students from Early Dawn Elementary went on a field trip to Lamplight Caverns with fourth grade teacher, Carrie Delaney and a few parent chaperones. Just as they were packing up to leave, the caverns began to shake. The kids began to scream as the lights went out, and one man from the group went out to see what was going on. Upon his return, he informed those within that Washington, D.C. area was bombed.

Carrie Delaney, being the last of the adult survivors, decided to go scavenging and never returned—leaving the kids to fend for themselves. Within the next month of exploring the caves, the children came upon Vault 87, where they pounded on the door for hours, pleading for assistance. In January the city of Little Lamplight was founded, and one of the older kids, Jason Grant, was elected as the first mayor.

The children of Little Lamplight turned against all "mungos," kicking out residents once they turned 16. Most of these adults then head to the settlement of Big Town, after being told that a good life awaits them there. Joseph, a 15 year old, teaches the kids classes using holotapes acquired from the vault by scavengers for basic schooling, such as reading, basic math and encyclopedias.

Little Lamplight possesses only two permanent laws which must be followed: 

Lamplight Caverns
A small cave descends to the town's entrance area, which is protected by a fence with a large front gate. Beyond the fence, a small area with the Little Lamplight office building, the town's medical office and school, opens into two small corridors. The first corridor leads to the restaurant Spelunkers, situated in a cave with pools of water, and the Great Chamber beyond. The second tunnel leads to a medium-sized cave which contains the Lamplight restrooms, and the souvenir shop, the town's store. Another access to the Great Chamber can be found here, as well as a small path to the town's back gate, leading to Murder Pass.

The Great Chamber
The Great Chamber area is a huge cavern, with wooden walkways connecting various suspended rooms. It serves as the main living area for the Little Lamplighters, containing a number of beds. The floor of the cave is partially filled with rubble and slightly irradiated water. Besides the two exits leading to Lamplight caverns, there are two cavities in the chamber's wall; one contains a workbench, and the other leads to Vault 87's Reactor Chamber.

Loot

 * Schematics - bottlecap mines, sold by Knick Knack in the souvenir shop.
 * Wazer Wifle, carried by Biwwy.
 * Bottlecap mine in the Great Chamber, in a niche in the northwest side of the cave (see map).
 * Five holotapes, two My diary, by Jason Grant in the souvenir shop, January 26, 2077 -- Little Lamplight! over the pool table in the Great Chamber and two Journal of Carrie Delaney in office building.
 * Blast Off pajamas - Worn by Bumble.
 * Kid's cave rat outfit and Murray the mole hat - Both worn by Zip.

Appearances
Little Lamplight appears only in Fallout 3 and is mentioned in Fallout 4.

Behind the scenes

 * Emil Pagliarulo stated that Little Lamplight's location was loosely based on Luray Caverns in Virginia.
 * Nathan Purkeypile designed much of Little Lamplight's layout, lighting and cluttering. He also stated that the settlement's light sources were inspired by glass floats.

Bugs

 * Princess and the other child guarding Murder Pass may spawn on the other side of the gate. This most commonly happens when using the "Wait" option in front of the door.
 * There is a possible glitch where the door to Murder Pass will not open under any circumstance.
 * Upon first entering the caverns to Little Lamplight, the gate is pulled up and the children are fleeing. Going into Little Lamplight reveals super mutants are attacking, after dispatching the super mutants, Mayor MacCready will talk to the player, with the only option available being the Speech check asking to be admitted. MacCready no longer mentions Paradise Falls or gives such a quest option.