Brooklyn, Las Vegas, Miami, and Los Angeles are seeing record travel growth, with Millennials emerging as the top spenders driving U.S. tourism forward. A new study shows Millennials now average 2.5 trips per year, spending nearly $3,500 annually on leisure travel. Social media platforms like YouTube and TikTok are fueling inspiration, while the mental health benefits of vacations further strengthen demand, making America’s top cities must-visit destinations.