How does one measure the greatness of a place—in miles covered, dollars spent, or visitors captivated? Such metrics can play a part, but also important is something that many travelers aspire to experience: the sense that one has stumbled upon the extraordinary. To compile our second annual list of the World’s Greatest Places, TIME solicited nominations across a variety of categories—including museums, parks, restaurants, and hotels—from our editors and correspondents around the world as well as industry experts.