Homes make a city. More than buildings, roads, schools, markets, hospitals and shops, it’s homes and the people who live in them that create the life of a place. The Islamic State of Iraq and Syria conquered Raqqa, which it named its first capital, and eventually the Iraqi city of Mosul, where it declared its caliphate, in order to control millions of those lives. Between these twin capitals, ISIS militants ruled with a level of cruelty and madness almost unknown in our time.

Homes make a city. More than buildings, roads, schools, markets, hospitals and shops, it’s homes and the people who live in them that create the life of a place. The Islamic State of Iraq and Syria conquered Raqqa, which it named its first capital, and eventually the Iraqi city of Mosul, where it declared its caliphate, in order to control millions of those lives. Between these twin capitals, ISIS militants ruled with a level of cruelty and madness almost unknown in our time.

Tomas van Houtryve followed Mexico’s long-forgotten northern boundary to meet families who have lived in the region, now forming part of the United States, for centuries.

Photographer Ryan Vizzions looks back on one of the largest protest movements in American history: what’s changed since, and what he hopes will come next.

Garie Waltzer’s personal evolution as a photographer in some ways mirrors the wildly radical transformation of the medium itself during the past 50 years. After working as a painter as an undergraduate student, she embraced analog photography; later, she described her relationship to the medium as being “infused with a love of process and materials” and her work as straddling “the boundaries of what was considered ‘photographic.’” Waltzer was an early adopter of digital imaging, working with scanners and Apple computers in the 1980s; she combined digital output from imaging machines intended for business applications with drawing and other expressive techniques to create large-scale color electrostatic collages. Her hybrid use of imaging technologies and painterly strategies continued throughout the 1990s and into the early 2000s. But, just when, as she describes it, “the avalanche of digital work” revolutionized photography, Waltzer took a hiatus – and when she returned to photography, she came back to the analog world.

If sharing is caring, we are a very invested species. In the center of SFMOMAs snap+share exhibit, a landslide of glossy photos, the physical manifestation of pictures uploaded on a sharing site in a single, cascade from the walls. Filling the room like high tide, Erik Kessels installation is what Senior Curator Clement Cheroux calls a “massification” of images. Impossible to walk through without lingering over a photo amid the peaks and valleys of images, the piece overwhelms, amuses and gives pause.

The sport is so popular in the North African nation and the region, that it’s been given the Marxist treatment: “We call it the opium of the people,” Fethi Sahraoui said. Since 2015, Mr. Sahraoui has photographed roughly 30 games in his hometown, Mascara, and in neighboring Relizane. The result is “Stadiumphilia.”

In December, 1969, the photographer Bill Owens got a call from his friend Beth Bagby, who occasionally shot photos for the Associated Press. As Owens explains in his new photo book, “Bill Owens: Altamont 1969,” the A.P. wanted to hire him for a day “to cover a rock and roll concert in the Altamont hills.” The Altamont Speedway concert had been reported as the West Coast’s response to Woodstock. It was also part of a return to public view for the Rolling Stones, who had started touring again, after nearly two years off the road. Their efforts began in July, with a free show in London’s Hyde Park. The concert was a success, an entirely peaceful event financed and filmed by Granada Television. Security had been provided by a ragtag group of people wearing leather, who the Stones mistakenly believed were part of the Hells Angels. Emboldened, the Stones hired the man who organized the Hyde Park concert, Sam Cutler, to work on an American tour in the fall of 1969.

As Brian Otieno was waiting to start college six years ago, he spent his days snapping pictures with his phone as he wandered the unpaved streets and alleyways of Kibera, a sprawling shantytown on the outskirts of Kenya’s capital, Nairobi. Often referred to as Africa’s largest slum, Kibera is home to up to a million people living side by side in ramshackle homes. Poverty, crime and hardship have long defined its visual narrative.

American photographer Rosalind Fox Solomon is a master of precision and poise, capturing the most compelling moments in life. On April 2 – her 89th birthday –Solomon will receive the Lifetime Achievement Award from the International Centre of Photography.