The early film star, Mae West, said, "Too much of a good thing can be wonderful." Obviously, she wasn't talking about tourism. Before the pandemic, many of Europe's major cities were choking on crowds. Venice probably had the worst of it, with gigantic cruise ships sailing up the Grand Canal disgorging thousands of tourists all at once into the narrow already overcrowded sidewalks. And Barcelona's La Rambla had become crushed that they had to ban tour groups from the Mercado.