Children playing on Walled City rooftop in Hong Kong, 1989. The lack of formal governance in the Walled City led to challenges, but it also fostered a unique system of informal social order. (Photo by Greg Girard/The Guardian)

This photograph shows the famous Lyonnais fresco by CiteCreation with a tag depicting the Abbe Pierre with the word “rapist” next to it, in Lyon central-eastern France, on September 30, 2024. (Photo by Jeff Pachoud/AFP Photo)

Competitors bounce off the wall following their Men's 60m Heat on day one of the World Athletics Indoor Championships Nanjing 2025 at Nanjing Youth Olympic Games Sports Park on March 21, 2025 in Nanjing, China. (Photo by Cameron Spencer/Getty Images)

The picture dated February 24, 2025 shows Squadron Leader Nathan Sawyer, the RAF Typhoon display pilot for the 2025 season, practising over RAF Coningsby in Lincolnshire ahead of this year's airshows. Wisps of rainbow vapour were seen coming out of the tail as he put the plane through its paces at 1500ft. (Photo by Claire Hartley/Bav Media)

Big wave surfers on their jet skis in front of a surf of a huge wave on the rock of Sao Miguel Arcanjo fort and Nazare lighthouse during a surfing session at Praia do Norte on January 27, 2025 in Nazare, Portugal. (Photo by Stefan Matzke - sampics/Corbis via Getty Images)

Attendees dressed as Puerto Rican-inspired Buggy the Clown, right, and Hatsune Miku pose during New York Comic Con at the Jacob K. Javits Convention Center on Saturday, October 11, 2025, in New York. (Photo by Charles Sykes/Invision/AP Photo)

Models promote a condom brand at the first Shenzhen s*x Culture Festival on September 21, 2007 in Shenzhen of Guangdong Province, China. The festival aims to increase awareness about reproductive health and popularise s*x education. (Photo by China Photos/Getty Images)

Ngorongoro Crater (Tanzania). At 610m deep and 260 sq km, this is the largest unflooded caldera in the world. A blue-green vision from above it's a haven for engangered wildlife and Maasai livestock. The crater was formed three million years ago when a giant volcano, which could have been as high as Kilimanjaro, exploded and collapsed. The caldera formed the concentric fractures in the crust cracked down to a magma reservoir deep underground. (Photo by John Bryant/Getty Images)