The Lello bookstore in Porto, Portugal has a lot of visitors just for sightseeing (if you search for photos you'll get why), so they started to charge €3 (~$3.6

The Lello bookstore in Porto, Portugal has a lot of visitors just for sightseeing (if you search for photos you'll get why), so they started to charge €3 (~$3.6) for the entrance, refundable if you purchased a book. Still, seems like Powell's experience is all about the books themselves, so that value should be well captured in increased sales.