The woman leader of the city recently called for tourists to cool it in the famous red-light district. She insists the gawkers make it "unpalatable" and "humiliating" for the so-called sex workers. Over 20 million visitors now come to Amsterdam annually, compared to just 10 million in 2000.

Of course, the ladies of the night pose in their brightly-lit shop windows to hustle up business, and in Amsterdam are as legal as any other. And if they are as attractive to gawking, selfie tourists as the Mona Lisa and Girl With The Pearl Earring, so be it.