Sahaflar Çarşısı, also known as the Grand Bazaar of Books, is a historic used bookstore located in Istanbul's Fatih district. The market has been in operation since the Ottoman era and has a wide selection of second-hand books in Turkish, Arabic, and other languages. The market is a maze of narrow alleys and small shops, and it's easy to get lost among the stacks of books. The atmosphere is lively and bustling, with vendors calling out to passersby to come and browse their selection of books.