1. Gear outside a location found all over the country, maybe a police station, gregs or town centre shop like Vodafone store
2. Gear inside a supermarket
3. Gear at one specific place, like Leicester Square or at another famous location
Countries other then the UK may not have a vodafone store and I don't even know what a Greg is. :-)
Therefore I like the transportation hub idea best. It's something most of us have in the vicinity of their home, it's a challenge and very exciting to see others in such a location.