Thousands of people, many donning anti-Trump signs and wearing pink hats, gathered in cities across the nation as part of Women's March events.

In Washington, D.C., 500,000 protesters were expected to fill the streets of the nation's capital.

Protesters crowd the National Mall in Washington, D.C., during the Women's March on January 21, 2017. (Photo: Zach Gibson, AFB/Getty Images) 

Chicago Police tweeted an aerial photo of massive crowds Saturday. Due to the large crowd on hand, today's Woman's March has been changed to a Rally," the Chicago Police department said in a tweet.

In Los Angeles, 100,000 people RSVP'd to take part in a Women's March, KTLA-TV reported.

More than a million people attend women's marches worldwide.

In Indianapolis, thousands rallied at the statehouse.

Snow didn't stop people from attending a march in Boise, Idaho.

More than 100,000 people attended the Denver Women's March, according to the Denver Post.

In St. Louis, Mo., an aerial shot showed thousands gathered for a Women's March demonstration.

100,000 attended a march in Boston, according to the Boston Globe.