In one of the largest days of protest in U.S. history, millions took to the streets Saturday one day after the inauguration of Donald Trump. The largest protest was the Women’s March on Washington, where more than 500,000 packed the streets. According to crowd scientists at Manchester Metropolitan University in Britain, the crowd was roughly three times the size of the audience at President Trump’s inauguration a day earlier. Women-led marches took place in over 600 locations spread across seven continents—including Antarctica. In addition to Washington, massive protests took place in Boston; Chicago; Denver; Los Angeles; Madison, Wisconsin; New York; Oakland; Portland, Oregon; St. Paul; San Francisco and Seattle. According to one count, as many as 4.6 million people took part in the global day of action.