My all time favorite bookstore was a tiny cellar in Washington, DC.
Moonstone Bookcellars.
Nothing but Science Fiction and Fantasy.
I would only go a couple of times a year simply because it was murder on my back.
I'd walk in with a couple hundred books and walk out with a heavy box and months worth of reading.
They got put out of business by the megastores.
Them I still miss.
The megastores if they really die, not so much. (shrug)