Tree Fort

The Tree Fort (or possibly the Ward Residence) is Finn, Jake, Beemo, and Neptr'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, and a wide look-out view.

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. In the episode "My Two Favorite People", Finn and Lady Rainicorn play video games on Beemo in this room. There is a clock on the wall that says, "Finn and Jake Timeless".

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's tree's trunk. On Finn's bed is his mummy style sleeping bag on top of many pelts of various evil-looking furred and scaled monsters, assumed defeated by Finn himself. Finn dislikes worms crawling on his bed, as shown when he threw a book (possibly The Enchiridion) at the worm. 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."

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 somekind.

Cave
A small cave is built into the tree fort on its back side. The cave is full of tools, and in the episode "What is Life?", Finn builds Neptr there.

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 is by climbing into a bucket and using a pulley system to haul the person or objects up. It seems to be an abandoned area since there are only a few items that are useful.

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!".
 * 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, (best seen in "The Jiggler" and in "Rainy Day Daydream") there is a ripped picture of a seemingly naked woman.