Whole Cake Chateau

The Whole Cake Chateau was the three-layered massive castle of Big Mom, located at the center of Whole Cake Island. Following the detonation of the Tamatebako bomb, extensive damage was caused to the Chateau's base, resulting in the collapse of the entire castle. Streusen transformed the building into spongecake in order to dampen the impact, thus causing the resultant product to cover Sweet City.

General Layout
Whole Cake Chateau was the largest cake building found in Sweet City. It had a total of ten floors, and dwarfed essentially all the other buildings and landmarks of the island (actually being larger than Sweet City as a whole). It was situated roughly centrally on the island, being surrounded by Sweet City.

The Baum (バウム) is the name of the hallways in the Chateau. Luffy ran through one on the third floor, while he looked for Sanji. Another one on the second floor was way partly destroyed when the chateau collapsed. Baum is German for "Tree", and considering the overall food theme, might come from Baumkuchen or Baumstriezel, which are types of Spit Cake; a kind of european cake made from rolled dough.

Underground

 * The Prisoner Library (囚人図書室) is where Big Mom keeps her prisoners inside the World of "Books" using Mont-d'Or's ability. The known prisoners were Monkey D. Luffy and Nami. Numerous books are stored in the Prisoner Library, and the one within which prisoners in the process of being tortured or questioned are faces a large sofa where executives can sit while talking with the prisoners.

First Floor

 * The Library (図書室) is located on the first floor of the Chateau. It is where Big Mom collects, categorizes and stores in large books the special creatures she finds interesting, where they do not age thanks to her nineteenth son Charlotte Mont-d'Or's ability. Some of the captured creatures are: a manticore from Impel Down, a unicorn, a Doskoi Panda, a kinokobito, a centaur from Punk Hazard, a griffin from South Blue, a longlimb, and a dinosaur.

Second Floor

 * The Guest Rooms (客間) are where guests of the island may reside, particularly those awaiting a marriage. There is at least one guest room on the second floor.
 * The Meeting Room (会議室) is where members of the Big Mom Pirates and Charlotte Family can meet to discuss current events in Totto Land.
 * The Einbaum Meeting Room (アンバウム会議室) is located on the eastern side of the second floor. During the collapsing of the chateau after the Tamatebako box explosion, the room was severely damaged. Einbaum is german for "Dugout".

Third Floor

 * The Courtyard (中庭) is a large room located on the third floor of the Chateau. It has large windows with bright curtains. It is decorated to appear like an outdoor garden, with a cloudy wallpaper, plants, rose archs, and gazebos. It also has a large table where Big Mom can dine with her guests, with a large seat fitting the Yonko's great size. This is also where Vinsmoke Sanji and Charlotte Pudding first met.
 * An Infirmary (医療室) is situated on the Chateau's third floor. It was there that Vinsmoke Reiju was taken for treatment and rest after being attacked by Pudding.
 * There is an unspecified Einbaum (アンバウム) which is located on the third floor. It had large windows, covered by thick curtains.

Fourth Floor



 * The Room of Treasure (宝物の間) is a large room located on the fourth floor of the Chateau. It is where Big Mom stores her most valuable treasures, including three poneglyphs, one of which is her Road Poneglyph. The unique door leading to that room is very tough, although Big Mom easily destroyed it. It is noted that even her children are not so easily granted entry to this room.
 * The Alcohol Storehouse (酒貯蔵庫) is located next to the Room of Treasure. It is filled with barrels.
 * A Women's Bathroom (女子トイレ) is also located on the fourth floor, and possess mirrors that connect to the Mirro-World.
 * There is at least one other Infirmary on the fourth floor.

Sixth Floor

 * There are at least two Guest Rooms in the sixth floor. One is currently inhabited by Vinsmoke Sanji, while the other is inhabited by the rest of the Vinsmoke Family.

Eighth Floor

 * The Giant Kitchen (巨大キッチン) is where the preparations for big events are held, and where the cake for Charlotte Pudding's and Vinsmoke Sanji's wedding was made. It is ran by Streusen.

Ninth Floor

 * Big Mom's Bedroom (ビッグマム寝室) is where Charlotte Linlin, Napoleon, Prometheus, and Zeus spend their nights. The room has a large mirror that connects to the Mirro-World.
 * The Bride and Groom's Room (新郎新婦控え室) is where the betrothed couple wait before their wedding ceremony. It is a large hall with a picture of the Whole Cake Chateau and other baked goods.

Rooftop

 * The Party Hall (お茶会会場) is a large outdoors space where big events such as the tea parties are held. It has a large double-door Homie at the entrance and a large staircase from which Big Mom enters to greet her guests. Like most of Totto Land, everything in the room is eatable, and there are several homies who serve drinks and snacks. Several tables are disposed in a staggered arrangement, where guests can sit and chat. Charlotte Smoothie is also making drinks for the guests thanks to her ability.

Unknown Floor

 * The Queen's Chamber (女王の間) is a two storey room, where Big Mom usually resides. It has a throne adapted for Linlin's great size, which is adorned with sweets and candies. Several supersized ice cream cones and bowls, alongside other sweet food, are standing and laying around her throne. The Queen's Chamber is also where she can discuss with people about matters such as alliances, departures, demands, or requests. The anime depicts this room to be on the eighth floor.
 * Pudding's Room (プリンの部屋) is where Charlotte Pudding resides. The door to the room is a talking door that will not open to unexpected people when its master is busy. The room also has access to a wide balcony overlooking the island.
 * Galette's Room (ガレットの部屋) is where Charlotte Galette resides. In the room there is a closet with a mirror connected to the Mirro-World.
 * The Execution Room (処刑場) is a room with bones and a mirror connected to the Mirro-World.