There isn't too much known about The Infinite Library, since exploring it in its entirety is literally impossible.
The Infinite Library consists of a desk at its front, with a lavish carpet extending forever behind it. On either side of the carpet are two rows of bookshelves that extend endlessly in an infinite maze of literature. Each left row of bookshelves are labeled with a number starting at 1 and counting upward as they get further and further away from the front desk. The walls of the Infinite Library are white and the roof is infinitely high up. The only light source is a ambient light coming from overhead with a white and yellow hue. The Infinite Library does have a known end, in terms of the end of the carpet that extends down the middle of the bookshelves, and there you will find that the bookshelves there starting counting from -1 and downwards, just in the other direction.