Holy moly, I’d wager about 75% of the people in Toledo, Spain, were on a tour of some kind. We’re totally cool with tours, but when you get thirty or forty people following the directions of a single guide they do tend to exhibit a kind of hive mentality. All individual thought (and most notions of common courtesy) goes out the window. Get three or four of these hives together in the narrow streets of a medieval city, and it’s a little like being swarmed by a zombie horde; except that none of them has tried to eat us. Yet.
Everywhere Once 
Wait until you find yourself in the middle of a tour mob that has missed lunch…
I think tours serve a useful purpose (and have done many myself!), but often it comes with the herd-like single-minded focus on whatever has been determined to be worthy of inclusion, and blindness to anything not on the itinerary.
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Tour groups are a pain, but individual small groups – four people, three people, even two people – can be too. Many of them have no problem filling the sidewalk and dawdling, with no thought about the people behind them. And then there are the people who decide to stand right in front of, say, the cathedral, to consult their guidebooks when they could have done it inside…. Don’t get me started!
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it’s when ALL the women need a toilet stop at one working WC!
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