Tree Fort

The Tree Fort is Finn, Jake, and BMO's home, and where they can usually be found when they aren't adventuring. It includes a living room, a bedroom, a kitchen, a pond, a well, a bathroom, an attic, a garage in the episode "What is Life," a secret place in the episode "Dad's Dungeon" and a wide look-out view.

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.

Entrance / Treasure Room
The entry to the tree house is filled with all the treasure Finn and Jake have collected on their many adventures. Minus all the heaps of gold, the room 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, and a few other unusual things.

The entrance can best be seen in the episode "Video Makers" when Finn is looking for a video camera.

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 because its so empty. But 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, several long tables, and a large monster-skin rug. In the corner there is an old phonograph and what looks like a wood burning stove with a pile of kindling next to it. This is the room where many of the typical activities that Finn and Jake occur, 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.

Finn's bedroom
Finn's room is over the living room and is accessed by a ladder made of planks nailed into the Tree Fort tree's trunk. On Finn's bed is his Eskimo-style sleeping bag on top of many pelts of various evil-looking furred and scaled monsters, assumedly defeated by Finn himself. Finn dislikes worms crawling on his bed, as shown when he threw a book (possibly The Enchiridion) at a worm and he stated "no worms on the bed." Next to the bed is an end table with what seem to be a mug and a rusted muffler on it, and beneath the end table is what looks like a large magnifying glass. Over the head of the bed, the jaws of a very large shark are hung on the wall 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 and in the intro has Beemo set on it. They apparently keep a cricket beside Finn's bed in a jar as seen in "Her Parents." 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, the root next to the bed is gone, and it has a fireplace.

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. Cake has not been seen sleeping in her bed, however it can be speculated that she does mainly because of the similarity between her and Jake.

Cave
A small cave/megalithic structure is built into the tree fort on its back side. It appears to be where Finn and Jake keep tools and equipment for 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, presuming that nobody cleans it. Seemingly, the only way to get to the attic from the weapon room (the branch directly below) is by climbing into a bucket and using a pulley system to haul the person or objects up. Otherwise, using the bridge which connects 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 was talking to Marceline about Princess Bubblegum's 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.

Weapon Room
The Weapon Room, as its name suggests, is a room that stores weapons. It has a large gauntlet, a small gauntlet, and a small bomb that resembles a nuclear weapon. So far, it has only appeared in "Rainy Day Daydream." It also has a bookcase, a chair with a pillow, and a desk with a notebook near the large gauntlet. Other than that, there is not much in the form of weaponry. There are way more swords and weapons scattered around the tree house than there are in the weapon room.

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 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."

Bathroom
This room was seen in only two episodes, "Marceline's Closet", and "Five Short Graybles." It is possibly located near the bedroom. It consists of one 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.

Bridge
Seen in "Rainy Day Daydream," this is where it links the extra room, 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. The only time it has been damaged was in "Beautopia." Susan ran through the wall. It comes with a couch, a table, a picture (see 'Trivia' section bullet point 4), 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.

Expanded List of Tree Fort Tentants

 * Finn
 * Jake
 * Beemo
 * NEPTR
 * Shelby
 * Bazooka Goblin
 * Riddle Master
 * The Troll Family
 * Giant Worm King (Formerly)
 * Worms (Formerly)
 * Ash (Formerly)
 * Marceline (Formerly)
 * Cherry Blossom Ghost (Formerly)

Trivia

 * According to creator Pendleton Ward, Finn and Jake built the tree fort themselves, although the tree was originally owned by Marceline, as seen in the episode "Evicted!." The tree fort was also still around in Marceline's day, as seen in a flashback in "Memory of a Memory."
 * According to Finn, Science Cat and Shark appear here at 4:00 P.M. everyday.
 * 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, (best seen in "The Jiggler," "Rainy Day Daydream," "The Duke," and "Beautopia") (seen briefly in "Guardians of Sunshine") there is a ripped picture of a seemingly naked woman. However, according to Natasha, "It's not a naked woman, it's a woman in a crappy snapped bikini."
 * The Tree Fort is the only tree in the Grass Lands so it may be a type of landmark in the grass lands.
 * Finn and Jake keep piles of gold coins, gems, and other treasures in their house that appear near the door in "When Wedding Bells Thaw" and other episodes. Ironically, in "Wizard," when Finn thought he had to pay for the last magic lesson, he apparently said "You can't do this to me man, I got no money!" Although he could've meant that he had no money with him instead.
 * In some episodes like "Slow Love" and "Guardians of Sunshine," the Tree Fort is nearly destroyed but then rebuilt.
 * It runs on a generator behind the fort.
 * The treehouse as seen in "Business Time" is completely different from the regular build in later episodes. This is likely due to the episode's original sneak-peak airing, during which the treehouse design was apparently unfinished.
 * The tree is likely not alive since it is hollow, has openings, and has been destroyed in three episodes.
 * It is an area for 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, a torn painting is visible above a shelf in the background which appears to depict a human figure wearing a uniform from Star Trek.
 * The Tree Fort is supplied with water by rain captured in barrels from a captive cloud which is somehow tied to a platform on the back of the tree.