The first true comic shop I went to was the original Forbidden Planet in London; a fantastic shop and a treasure trove for me as a kid, and far different to the boring, soulless, corporate entity it later became. I'd never seen such a wide range; so much imported new material not distributed to the UK, independent books I previously didn't know existed such as Cerebus and Richard Corben undergrounds, and my first exposure to original EC comics, with a long wall dedicated to them.
Whenever we had a school genealogy trip down to London my teacher would, after an hour or so, and very liberally, allow me to go off around the city, and I'd quickly rush over to the shop and spend most of the afternoon there, meeting up with the group again at the railway station around 4pm. Also, I hated school even though I tested well, and would have a 'day off' each term when I'd go down on the train from Manchester to buy another stack of new imports and a few back issues.
Great, magical memories.