Karl's library

Karl's library is a building located in Kinoko Kingdom used to house Karl's diaries written about his experiences in each episode of Tales from the SMP. It was originally a small room built in the ruins of L'Manberg near the former location of Party Island, but was relocated after the area around it became overrun by the Blood Vines.

Original library
The library's front room was built out of dark oak planks and bookshelves and illuminated with soul lanterns. It had a trapdoor that revealed a ladder down to a second room built in the same way.

Behind a wall in the front room was a hidden back room that is the real main feature of the library with dark oak walls and a carpet with a green and purple swirl, which referenced Karl's original hoodie. It was the place where Karl kept track of his travels through time during Tales from the SMP. The secret room contained a chest in the corner that contained Karl's diary entries and a table that went all around the wall. Item frames were placed on top of the table and above the table on the wall. Some of frames on the walls held poster art for the individual episodes while others held empty books and quills to document future tales. Item frames placed on top of the tables contained already-completed books detailing the events of each episode.

Underneath the secret room was a cave. The cave was the place where Karl usually reappeared when returning to the present. It was connected to the hidden room via a ladder.

Original library
The library was built by Karl on January 4, 2021 off-stream. It was revealed the same day after Karl showed Ranboo the library. The library was first used in the "The Lost City of Mizu" episode of Tales from the SMP on January 24, which was also when he wrote his first diary entry. At the end of the "The Masquerade" during Karl's visit to The Inbetween, the books he found instructed him he needed to move the library.

Relocation
Karl decided to move his library a week later on February 3, 2021 to a new country with the help of Sapnap and GeorgeNotFound. He decided to make it way bigger than it once was, making it two stories and inspired by mushrooms. It is located near a lake they named "squid lagoon" and Alyssa's barn, which was repurposed into a mushroom tree farm. The new country was later named Kinoko Kingdom on March 9, 2021, and Karl also got help from Foolish Gamers and BadBoyHalo to finish the library. At the same time, Karl also contracted Foolish to build out the country with many structures around the library.

Trivia

 * The original room and Karl's entire time traveling persona were inspired by several fan artists on Twitter.