Today was a big moment for women’s solidarity. Millions of people turned out in cities and towns around the world to demonstrate for women’s rights and challenge the presidency of Donald Trump. Thousands sported pink hats and carried signs with sharply worded messages for the new administration.

In total there were at least 670 events around the world, but the Women’s March on Washington was one of the most robustly attended, with at least 500,000 people estimated in the crowd.

Here are some of the most spirited and engaging signs our reporters and editors in the field saw on the streets of Washington, DC:

These girls held these signs as well as one with a quote from Hillary Clinton’s concession speech: “To all the little girls watching, never doubt that you are valuable and powerful.”

A group of scientists marched to defend science and evidence-based thinking. They said their sign with the chemical equation is a specific message for Trump.

Artemis Westenberg, below, flew to DC from Rotterdam, the Netherlands, for the march. She’s the president of a Dutch feminist organization that advocates for women’s rights.

Sara Rahim, 27, moved from Sudan to get her education in the United States in 2004. She said that it’s “very frustrating” to have lived under a dictator like Omar al-Bashir, who was indicted by the International Criminal Court, only to have “someone who is essentially not much different” from him rise to power in the United States.

A big military truck in the middle of the crowd had signs reading “LGBTQIA+ Equality,” “Intersectional Feminism,” and “Respect Women of Color” tucked under its windshield wipers.