Tree Fort

The Tree Fort is a "guard outpost" on the edge of the Candy Kingdom, as well as the home of Finn, Jake, Shelby, BMO, CMO, and Neptr, and where they can usually be found when they aren't adventuring. It was formerly owned by Marceline as revealed in "Evicted!." The fort includes a living room, a bedroom, a kitchen, a pond, a well, a bathroom, a chicken coop, an attic, a storage cave/garage (shown in "What is Life?"), a secret place (shown in "Dad's Dungeon" and a wide look-out view. After Flame Princess destroys the Ice Kingdom in "Frost & Fire," Ice King is temporarily moves into the Tree Fort in "Earth & Water", but leaves in "Play Date" after he reveals that the Ice Kingdom had been rebuilt for weeks.

The Tree
The tree itself is a species of willow, most likely a weeping willow. It appears to be completely hollow. The entire interior of the tree trunk is covered in boards. In the distant future [Probably around 1000 years] as seen in "Lemonhope Part 2", the tree grows much taller, reaching into the clouds.

Entrance/Treasure Room
The entry to the tree fort is filled with the treasure Finn and Jake have collected on their many adventures. Without all the heaps of gold, the entrance is a simple empty room with a wood front door on one end, and a ladder leading up into the hollow trunk of the tree on the other.

The treasure in the entrance seems to include old TVs, VHS tapes, a unicycle, lots of gold, a Nintendo Entertainment System (NES) complete with several games, a rubber duck float, a skull stabbed with a sword and a few other unusual things the duo picked up during their travels. The entrance can best be seen in the episode "Video Makers" when Finn is looking for a video camera. It can also be seen in "Play Date" when Finn and Jake dump their treasure in the room and later at the end when Ice King and Abracadaniel summon Kee-Oth the demon.

In "Furniture & Meat," Finn and Jake decide to spend all of the treasure in the treasure room. Some of the gold was spent by them, and the rest was melted by Wildberry Princess. The treasure room is now completely barren of any treasure, with the exception of a single gold coin found by Finn at the end of the episode.

Tree Trunk
The hollow trunk is completely filled with treasure. There is an intricate web of ladders to get around it. One of the ladders leads up into the canopy where the living room is located.

The inside of the trunk is very rarely shown as it is empty and relatively insignificant. Aside from that, it was shown in "Guardians of Sunshine" when the whole front of the tree was blown out.

Living Room
The living room is furnished with a brown colored couch, a little table they put BMO on when they play video games, (as seen in Business Time) several long tables, and a large monster-skin rug. In the corner, there is an old and what looks like a wood burning stove with a pile of kindling next to it. This is the room where Finn and Jake typically spend their leisure time, usually doing activities such as watching movies or playing video games on BMO. There is a clock on the wall that says, "Finn and Jake - Timeless." The living room is next to the kitchen.

There appear to be two living rooms: one with a long brown couch, round red couch, and cooler; and another with a purple chair and monster skin rug. The rug room is located one floor above the couch room. The 'couch room' may be the kitchen, as it contains the semi-nude painting referred to in the Kitchen and Trivia sections below - see: Painting in Living room.

Bedroom
The bedroom is over the living room and is accessed by a ladder made of planks nailed into the Tree Fort tree's trunk. The jaws of a very large shark are hung on the wall over his bed and a spiked mace hangs from the ceiling. The skin of some unknown six-armed beast lies on the floor as a rug. A large tree limb growing through the room has an old battered desk on it. There is an insect in a jar under the desk, as seen in "Her Parents." There is an empty room behind the giant root, as seen in "Rainy Day Daydream." The room holds a closet, a book shelf, a window, a picture of a ninja, and a weapon stuck in the ground. In the episode "Holly Jolly Secrets Part II," the bedroom is completely different from the bedroom in the other episodes. Their room in this episode is much larger, more bare as the root next to the bed is gone, and it has a fireplace. There are also many peculiar looking television screens that are on the walls that can be found throughout the house. So far the small TV's have found no use in the series other than acting as potentially noticeable decor.

Finn's bed
On Finn's bed is his Eskimo-style sleeping bag on top of many pelts of various evil-looking furred and scaled monsters. Finn dislikes worms crawling on his bed, as he demonstrates when he throws a book (the Enchiridion) at a worm and yells, "No worms on the bed!" in "Evicted!." Next to the bed is an end table with what seem to be a mug and a rusted muffler being used as a candle holder.

Jake's Bed
Jake sleeps in an open drawer of a cabinet, which also holds his viola, a picture of Lady Rainicorn, books, bones, and some of his other personal possessions such as a mug which looks to hold milk, ties, and a locket of a "J" covered with jewels.

Cave
A small cave/megalithic structure is built into the tree fort on its back side. It appears to be where Finn and Jake keeps their tools and equipment that require maintenance; it is here that Finn gains the material and equipment that he uses for "creating" Neptr in "What is Life?" This location is also used in "Hot to the Touch" for assembling fireproof suits.

Attic
The attic is seen in "Rainy Day Daydream." There are the initials "AT" (that presumably stand for Adventure Time) carved into the tree, and a rug with various items such as candy and books. There is also a picture of Lady Rainicorn near the rug. It seems to be very dirty, and it is presumed that nobody cleans it. Seemingly, the only way to get into the attic is from the weapon room (the branch directly below) by climbing into a bucket and using a pulley system to haul the person or objects up. Otherwise, one must use the bridge that is connected to the living room will grant access to the attic. It seems to be an abandoned area since there are only a few items that are useful. However, it appears that Finn and Jake do use it sometimes. It also appears in "Go With Me" when Finn talks to Marceline about Princess Bubblegum not liking him.

Yard
The yard has several features including plants, a pond, a well, a yurt (the round hut structure), a mechanical device that might be an electrical generator, and a vegetable garden in the back. The well does not have water in it. Instead, it is the entrance to the Beneathaverse where the Gnomes rule.

Den
The Den is a small room connected with the Living Room presumably used for miscellaneous purposes. It has a large gauntlet, a small gauntlet, and a small bomb that resembles a nuclear weapon. It has appeared in "Rainy Day Daydream" and in "Beyond this Earthly Realm." The room may also appear in "Holly Jolly Secrets Part II" when the Ice King breaks in, as the green divan is seen to the left of the chimney. It also has a bookcase, a chair with a pillow, and a desk with a notebook near the large gauntlet.

Boat
Seen mostly in the episode "Slow Love," Finn and Jake keep a boat as a type of look out view at the very top of a branch at the top of their Tree Fort. It has  an umbrella, a dining table and four chairs, a lamp, a carpet, a yellow-red telescope (sometimes pointed towards the Candy Kingdom as seen in the game "Legends of Ooo"), a tripod, and other small objects in it. It also appears in "Power Animal" at the roof party and "Dad's Dungeon" when Jake turned into different things for Finn and BMO.

Roof
The top of the tree that the tree house is built on.

Although the roof appears to be the top of the tree's canopy, it is a solid surface. Therefore, it has been used for parties and star watching as seen in "Power Animal" and "Incendium" as well as a solid surface for Marceline in "Marceline's Closet," towards the end of the episode, when Marceline is trying to imitate an owl sound, while lying there. She was spying on Finn and Jake, and was seen right after Jake sees Finn (vice versa) and the duo scream.

Bathroom
This room was seen in only a handful of episodes. It is possibly located near the bedroom. It consists of one wooden bathtub/shower, a mirror, and a toilet. In "Marceline's Closet," it shows it not having a door, but it has animal skins hung up in a doorway. This episode shows it being near their bedroom. In "Slow Love," it shows the doorway with animal skins if you look through the window, this may prove it is located in their living room. In "Five Short Graybles," it has a door and it is located in the hollow log in their kitchen. BMO uses this room in the episode to interact with Football, while in "Davey," it is the place where Finn had cut his hair.

Bridge
Seen in "Rainy Day Daydream," this is where it links the "attic," and the living room. There are two bridges on the fort as seen in zoom-outs of the tree fort.

Kitchen
This was seen in many episodes such as "Beautopia," "Conquest of Cuteness," and also in the game, Legends of Ooo. It has a couch, a table, a picture (see 'Trivia' section bullet point 3), a stove, and other kitchen appliances. The room must be on the ground level since Susan was standing on solid grass when she broke through the wall. This room is also referred to as a second living room, see "Living room" section above, and the house breakdown diagram in the gallery. Underneath the floorboards lie Shoko's remains.

Walls
Various creatures live inside the walls, as seen in the episode "Shh!," such as a humanoid male with a typewriter, a rather cartoonish-looking spider, and six mice with beds in various colors. There is also a cat sarcophagus surrounded by hanging decorations and small pyramids.

Full list of residents

 * Finn
 * Jake
 * BMO
 * CMO
 * Neptr
 * Shelby
 * Ancient Psychic Tandem War Elephant (formerly)
 * Lorraine
 * Ronnie
 * Lieutenant Whiskers
 * Officer Davis
 * Ash (formerly)
 * Marceline (formerly)
 * Fionna (fictional)
 * Cake (fictional)
 * Ice King (From "Earth & Water" to "Play Date")

Trivia

 * According to Finn, Science Cat and Shark appear near the Tree Fort at 4:00 P.M. everyday.
 * Shoko (otherwise known as the Ghost Lady or The Green Lady, which is also one of Finn's past life) died next to the Tree Fort when it was a little sapling. Her skeleton lies underneath to this day.
 * On a clock hanging in their tree fort, there's a picture of Finn and Jake on the hour and minute hands (respectively), surrounded by the words "Finn and Jake--Timeless."
 * On the wall above the couch in the kitchen/lower living room, there is a ripped picture of a seemingly naked woman. However, according to Natasha Allegri, "It's not a naked woman, it's a woman in a crappy snapped bikini."
 * Finn and Jake keep piles of gold coins, gems, and other treasures in the entryway to their house; though, in "Wizard," when Finn thought he had to pay for the last magic lesson, he said, "You can't do this to me man, I got no money!" though it is presumed that he didn't bring any money with him at the moment.
 * The den/weapons room contains a full suit of body armor, but in "Blood Under the Skin" Finn ignores this and goes to Choose Goose in search of armor.
 * In the episodes "Slow Love" and "Guardians of Sunshine," the Tree Fort is nearly destroyed but then rebuilt.
 * The tree fort as seen in "Business Time" is completely different from the regular build in later episodes.
 * The tree fort is an area in the game Project Exonaut.
 * It is shown in "Conquest of Cuteness" that there is a network of small tunnels with openings which the Cuties used to their advantage to quickly move around and escape from the fort.
 * In "Holly Jolly Secrets Part II," when the Ice King breaks in through the chimney, there is a picture of a humanoid figure wearing a uniform like the ones from .
 * In the back of the Tree Fort is a cloud, somehow tied to several rain barrels, as seen in "What Was Missing."
 * In "Holly Jolly Secrets Part II," there is a briefly seen picture of what looks like a human hand making the peace sign.
 * There is a sign saying "God Bless This House."
 * Besides gold, the treasure room has pre-war items in it.
 * In the Cartoon Network game Splashback, the Tree Fort is one of the backgrounds used in the game.
 * In the unused storyboard, "Brothers in Insomnia," Finn cuts down a large branch on the Tree Fort (the one on the left).