This photo provided by Lee County Historical and Genealogical Society shows the Truesdell Bridge in Dixon, Ill., in 1873. On May 4, 1873, a crowd of more than 200 gathered on the bridge to watch a baptism when it toppled over, trapping dozens of victims just inches below the river's surface. (Charles Keyes / Lee County Historical and Genealogical Society via AP)

Post-Civil War Dixon, 103 miles west of Chicago, was a growing city split by the formidable Rock River. On May 4, 1873, the 4-year-old bridge twisted, splintered and rolled over. Forty-six people perished, many immured by the unrelenting gridiron just below the water’s surface. 

Sheila Smith, Martha Scott, Diane Stevens and Judith Arcana were four of seven women arrested for performing illegal abortions in Chicago. (Credit: HBO)

A band of young women — most in their 20s, some in college, some married with children — banded together in Chicago to create an underground abortion network. The group was officially created in 1969 as the “Abortion Counseling Service of Women’s Liberation.”

W.G.N. Flag and Decorating Company employees make a Chicago flag. (WTTW News)

Many of the flags waving from civic buildings aren’t just representing Chicago, they’re made in the city’s South Shore neighborhood, by Chicago residents, who work for a company known as W.G.N.

(WTTW News)

Saturday marks the 186th anniversary of Chicago’s founding as a city. As the candles on its birthday cake have grown with the passing years, so too have Chicago’s borders. Here’s a look at how a once small-but-mighty city gobbled up surrounding land.

The nearly 7-foot-tall “Visions of Eternity” seemed to be an outlier among Salvador Dalí's work from the 1930s. (Salvador Dalí / Fundació Gala-Salvador Dalí / Artists Rights Society)

The curators, both working on the Art Institute of Chicago’s first show dedicated to Salvador Dalí, were researching his painting “Visions of Eternity,” which was dated to 1936 and had been held in the museum since the late 1980s. But red flags were mounting.

Former President Jimmy Carter appears on "Chicago Tonight" in 2006. (WTTW News)
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A look back at former President Jimmy Carter’s 2006 appearance on “Chicago Tonight” with John Callaway. 

When Chicagoans go to the polls to vote for mayor, there’s a crucial piece of information missing from their ballots: the candidates’ political parties. WTTW News Explains tells you the reasons why. 

(WTTW News)

A South Side community is getting up to $15 million to ensure it continues to tell the story of the Great Migration in the early 1900s. The Bronzeville-Black Metropolis National Heritage Area stretches from the South Loop to Woodlawn and is home to natural, historic and cultural resources.

How exactly are streets organized in Chicago? WTTW News gives you a guided tour of the grid system that organizes the city’s streets and addresses. 

(WTTW News)

For the first time in two dozen years, Illinois will get a new secretary of state. Former state treasurer Alexi Giannoulias, a Democrat, will be sworn Jan. 9 in to replace Secretary Jesse White, who did not run for reelection this year.

(Credit: Lee Bey)

What do you get when you put two of Chicago’s preeminent architecture critics together? A thought-provoking book about the city’s storied architecture.

“Latinos in Chicago: Quest for a Political Voice” by Wilfredo Cruz.

In his book “Latinos in Chicago: Quest for a Political Voice” author Wilfredo Cruz plumbs the history of Chicago’s Latino communities as they carved out a place for themselves in the city’s rough and tumble political climate. 

Katrina Quint, director of horticulture at Lincoln Park Zoo, stands in the shadow of the zoo's oldest inhabitant, a bur oak that's 250-300 years old. (Patty Wetli / WTTW News)

A bur oak has towered over the zoo’s south lawn, opposite the primate house, since before there even was a zoo. It even predates the founding of the United States of America. 

Mary Lane has been performing in Chicago for the last four decades. (WTTW News)

A local blues legend is receiving her flowers in a new documentary exploring her life. Now 86 years old, Mary Lane says she’s loved singing since she was 12 years old.

(Courtesy of Steven Walsh)

Through interviews with his grandfather and others who lived through the neighborhood’s rise and fall, filmmaker Steven Walsh shows what he says is the forgotten story of the area in his documentary “Southeast: a City Within a City.”

Michael Kutza, CEO Emeritus, of the Chicago International Film Festival. (WTTW News)

Michael Kutza was just 22 years old when he launched the Chicago International Film Festival. Decades later, he looks back on a life among the movie stars.