The Strand - the largest independent bookstore in the world. And they aren't kidding. It puts B&N to shame, at least in terms of variety. While mega chain bookstores tend to carry only the more-sought items, The Strand is a great source for hard-to-find, out-of-print or used/discounted books.
My favorite is the photography department. There's always an awesome selection of great monographs, and lots of them are heavily discounted. If you don't mind pulling up a spot on the carpet, you can sit and flip through a stack of books for hours.
The Strand has undergone an overhaul in the past year or so and is a lot more organized than it used to be. Still, with so many books on SO many things, sometimes it can be a bit tricky hunting down a gem. If you know exactly what you're looking for, it's simple enough to go to the help desk and have them check the inventory. However, if you're looking to, say, just find a "great photo book," it could be in one of three or four places. It's best as a place to go when you have time to spare and just want to poke around. Of course, this can be difficult at times because The Strand's no secret, and is often full of people obliviously clogging the isles.
Note: Don't bring a bag you're not willing to check at the door; apart from small purses, they're pretty adamant about their policy. So, don't buy a new I pod and bring it to the store with you...
Note 2: They have several locations, including a rare books department - though I haven't been to them.
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