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Tulips shop at Schiphol International Airport, fifth busiest airport in Europe, in Amsterdam, Netherlands, 26 April 2015. Amsterdam is one of the most popular tourist destinations in Europe, receiving more than 4.63 million international visitors annually. 16 million day trippers also visit the city every year. The majority of tourists originate from Europe. The largest group of non-European visitors come from the United States, accounting for 14 percent of the total. (Photo by Horacio Villalobos/Corbis via Getty Images)

Tulips shop at Schiphol International Airport, fifth busiest airport in Europe, in Amsterdam, Netherlands, 26 April 2015. Amsterdam is one of the most popular tourist destinations in Europe, receiving more than 4.63 million international visitors annually. 16 million day trippers also visit the city every year. The majority of tourists originate from Europe. The largest group of non-European visitors come from the United States, accounting for 14 percent of the total. (Photo by Horacio Villalobos/Corbis via Getty Images)