The photos below, taken by WGBH News' Meredith Nierman, detail the day of the Boston Women's March, held Saturday, Jan. 21. 

Marchers ride into the city on the Red Line T. 

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175,000 people marched in Boston on January 21, 2017. Boston Women's March.
Meredith Nierman

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175,000 people marched in Boston on January 21, 2017. Boston Women's March.
Meredith Nierman

The crowd of marchers began to form as buses rolled in from across the state, early Saturday morning.

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175,000 people marched in Boston on January 21, 2017. Boston Women's March.
Meredith Nierman

An estimated 175,000 people gathered in the hours leading up to the pre-march rally, including men, women, and children.

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Ten's of thousands march in the Boston Women's March, January 21, 2017.
Meredith Nierman

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Ten's of thousands march in the Boston Women's March, January 21, 2017.
Meredith Nierman

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175,000 people marched in Boston on January 21, 2017. Boston Women's March.
Meredith Nierman

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175,000 people marched in Boston on January 21, 2017. Boston Women's March.
Meredith Nierman

They carried with them an array of signs, all reflecting the variety of people and viewpoints present.

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Ten's of thousands march in the Boston Women's March, January 21, 2017.
Meredith Nierman

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Ten's of thousands march in the Boston Women's March, January 21, 2017.
Meredith Nierman

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Ten's of thousands march in the Boston Women's March, January 21, 2017.
Meredith Nierman

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175,000 people marched in Boston on January 21, 2017. Boston Women's March.
Meredith Nierman

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Ten's of thousands march in the Boston Women's March, January 21, 2017.
Meredith Nierman

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175,000 people marched in Boston on January 21, 2017. Boston Women's March.
Meredith Nierman

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Ten's of thousands march in the Boston Women's March, January 21, 2017.
Meredith Nierman

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175,000 people marched in Boston on January 21, 2017. Boston Women's March.
Meredith Nierman

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175,000 people marched in Boston on January 21, 2017. Boston Women's March.
Meredith Nierman

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175,000 people marched in Boston on January 21, 2017. Boston Women's March.
Meredith Nierman

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175,000 people marched in Boston on January 21, 2017. Boston Women's March.
Meredith Nierman

Politicians, civil rights leaders, and performance took to the podium to get the crowd fired up and ready to go.

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Mayor Marty Walsh
Meredith Nierman

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Sen. Elizabeth Warren
Meredith Nierman

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Boston NAACP President Tanisha Sullivan
Meredith Nierman

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Poet Nkosi Nkululeko
Meredith Nierman

The crowd was ready to march.

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175,000 people marched in Boston on January 21, 2017. Boston Women's March.
Meredith Nierman

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Ten's of thousands march in the Boston Women's March, January 21, 2017.
Meredith Nierman

Police cleared the way for the beginning of the march, which began on Beacon Street. 

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Ten's of thousands march in the Boston Women's March, January 21, 2017.
Meredith Nierman

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175,000 people marched in Boston on January 21, 2017. Boston Women's March.
Meredith Nierman

The march circled around Boston Common via Beacon, Arlington, and Boylston Streets before heading back onto Boston Common via Charles St. 

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175,000 people marched in Boston on January 21, 2017. Boston Women's March.
Meredith Nierman

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175,000 people marched in Boston on January 21, 2017. Boston Women's March.
Meredith Nierman

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Ten's of thousands march in the Boston Women's March, January 21, 2017.
Meredith Nierman

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Marchers add music to their demonstration.
Meredith Nierman/WGBH News

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Ten's of thousands march in the Boston Women's March, January 21, 2017.
Meredith Nierman