More than one million people marched through Washington, D.C., and other American cities Saturday to show support for women's rights and express their discontent over the election of President Donald Trump.
CNN did not make its own crowd estimates, but compiled official estimates from law enforcement agencies for many of the "sister marches" around the country that drew large crowds. The million-person count doesn't include the thousands of people who took part in the Women's March on Washington for which there was no official crowd estimate.
Marches were also held in cities around the world.
The biggest demonstration took place in Washington, where protesters filled Pennsylvania Avenue, the same street Trump walked down a day before during his inaugural parade. In the evening, the crowd moved toward the White House.
March organizers said protests took place in more than 600 cities across the world.
Attendance was not always easy to determine. For instance, Washington march organizers said about 500,000 people took part, but authorities did not confirm that number or provide their own estimate.
In Boston, 120,000 to 125,000 people protested, according to a police aerial photo analysis cited by a senior Boston Police official. Police said the crowd there was too big for the march route and could not proceed because "it would be like a snake eating its tail."
In Los Angeles, more than 100,000 people marched, police said. So many people crammed into the streets that "our march turned into a stand," said Ellen Crafts, who handled public relations for the event.
Police said 20,000 people protested in Houston, 60,000 in Oakland. In Atlanta, 60,000 people marched with US Rep. John Lewis, a major Trump critic.
CNN could not independently confirm any of these crowd estimates.
Overall, the protesters were law-abiding, with police reporting only four arrests in 21 American cities. Nobody was arrested in Washington.
"Sister marches" happened outside the United States, too.
People gathered to demonstrate in most major cities around the world, including London; Tel Aviv; Melbourne, Australia; Pristina, Kosovo; Moscow; Berlin and Mexico City -- often in front of US embassies.
London marches for 'hope not hate'
In Athens, Greece, protesters included refugees from Elliniko Camp, located in the old Athens airport.
There was even a protest in Antarctica -- about 30 eco-minded tourists and non-government scientists aboard a ship in international waters hoisted signs saying "Penguins for peace" and "Seals for science," organizers said.
The protesters, which included many men, hit the streets for different reasons, among them health care, the future of the Affordable Care Act, the environment and income equality.
But Trump's stated attitudes toward women and his comments about judging women by their weight and appearance kept coming up, as did his now infamous remarks about grabbing women by their genitalia.