Lucky 7

Introduction
Lucky 7 is a unique location found in the One Piece world, as it seems to be a ship, a civilized location, and something of an island all in one. As such, like Thriller Bark, Lucky 7 is an odd location, in that it doesn't stay in one place for too long. It's best described as a "nomadic town" by those who know of it. Aside from its fame as an oddity on the open seas, Lucky 7 is a ship that primarily consists of gambling casinos and hotels built on top of it. As a result of this necessity to house so many people and support a large number of buildings, it's one of the larger known ships seen thus far; only being slightly smaller than Thriller Bark by at least five miles.

Due to a need for proper funding, Lucky 7 affiliates itself with the World Government, and so it's mainly protected from outside threats by that very affiliation. Therefore, Lucky 7 not only gains much needed shelter from pirates and other criminals, but it also gets enough money to support the gambling houses found aboard it. It's unique situation, and its many casinos and hotels make Lucky 7 a rather famous location in the One Piece world, as a few people have either off-handedly mentioned it once, or even expressed a desire to visit it one day. Lucky 7 was the scene of an incident involving The Jolly Pirates, when they invaded the government-sanctioned ship in order to retrieve Hanuman from slave traders who had kidnapped him and planned to showcase him at Lucky 7 for profit. This resulted in increasing The Jolly Pirates' infamy, making them much more of a threat to the World Government than before (as the government considered the invasion and collateral damage to be an act of rebellion against its authority.)

History
Provide a history to the ship, if it has one. When it was build, major battles, anything that happened to the ship.

Trivia

 * Lucky 7's name is a bit of a pun on the number seven's association with good luck, as well as the fact that luck heavily determines who wins and who loses at gambling.
 * Lucky 7 was inspired by the real life location of Las Vegas, which is a famous hot spot for gambling, among other frivolous activities.