People attend the Dutch National Tulip Day in front of the Royal Palace at Dam Square on January 21, 2017 in Amsterdam, Netherlands. This day marks the official start of tulip season with a special tulip picking garden. Dutch tulip growers organized the event where people can pick the flowers for free. There are more than 1,000 different kind tulips and some 1.7 billion Dutch tulips are expected to bring spring into homes around the world. [Photo/IC]