The most beautiful bookstore in the world. And where JK Rowling frequented when she taught English in Porto. Also where her writing was inspired from....apparently.
Hence, it was super crowded. You pay 5 euros to get in and essentially you can get 5 euros off any book you buy. Most of the books were above 10 euros. Owners are laughing their way to the bank.
Most people go in to get this photo so here it is.