This gem in Downtown LA is one of my favorite places after a nice coffee at Coffee Bar. You could literally spend hours in this place. The first floor has a great selection of new and used books for all readers, while the second floor is a huge maze of bookshelves filled with hundreds or even thousands of books. Browse around or grab a seat, but I guarantee you won't leave empty handed.
When wandering downtown, make sure to step into the Rabbit Hole that is DTLA's Last Bookstore, one of the largest independent bookstores in the world. When you step through the old 1914 Citizens Bank facade, you will be transported to an analog world where over 250,000 new and used books, vinyl records, and graphic novels line two stories with high, ornately-decorated ceilings that are supported by grand marble columns. The upper level contains all things odd, hippie, and unique: the wrap-around mezzanine is home to bohemian gallery shops and a literal tunnel of books that takes you to a room of 100,000 $1 books. Check the bookstore's calendar for events ranging from readings to concerts.