To an outsider, their passion is at times illegal and often on the verge of life and death. But climbing rooftops of high-rise buildings and exploring abandoned facilities is in the blood of these young Muscovites. The small group calls itself “Rudex”, which stands for “roof and decay exploration”, and is akin a Western youth craze known as urbex or “urban exploration” of man-made structures. Here: Urban explorer Vad Him of Rudex team jumps whilst on a rooftop in Moscow, Russia, August 14, 2017. (Photo by Maxim Shemetov/Reuters)

A monument with old MiG fighter jet is seen next to a damaged civil infrastructure building at the site of a Russian military strike, as Russia's attack on Ukraine continues, in Vinnytsia, Ukraine on July 14, 2022. (Photo by Valentyn Ogirenko/Reuters)

Benfica's Portuguese forward Goncalo Ramos (R) vies with Portimonense's Japonese goalkeeper Kosuke Nakamura (L) during the Portuguese League football match between SL Benfica and Portimonense SC at Luz stadium in Lisbon on January 6, 2023. (Photo by Patrícia de Melo Moreira/AFP Photo)

Women take a selfie with a giant dragon lantern decorated near the frozen Houhai Lake in Beijing, Thursday, February 8, 2024. (Photo by Andy Wong/AP Photo)

Aerial view of people circling around bonfires to celebrate the Torch Festival on Axilixi Prairie on July 20, 2024 in Bijie, Guizhou Province of China. (Photo by Luo Dafu/VCG via Getty Images)

Sunrise over the River Thames and Tower Bridge in London today morning on January 28, 2024. It has been forecast that Sahara dust will be in the atmosphere. (Photo by Alister Gooding/Picture Exclusive)

Animal rights activists from People for the Ethical Treatment of Animals (PETA) stage a “die-in” to mark World Vegan Day in Piccadilly Circus in London, Monday, November 1, 2021. The demonstration sought to draw attention to the suffering and death of animals in the meat, egg and dairy industries. (Photo by David Cliff/AP Photo)

A man transports a car on a horse cart to a repair shop along a street in Amritsar on May 6, 2021. (Photo by Narinder Nanu/AFP Photo)