England Fans in London's West End after loosing in the final against Spain on July 14, 2024. (Photo by Jeremy Selwyn/SelwynPics)

Young siblings in costume fully embrace the Notting Hill carnival atmosphere in London, England on August 28, 2023. (Photo by Nico Froehlich/The Guardian)

An urban fox walks alongside the Mall in central London, Britain, November 29, 2016. (Photo by Toby Melville/Reuters)

Leigh-Anne Pinnock arriving at Gilgamesh Camden on September 30, 2017 in London, England. (Photo by Flynet Pictures)

A runner in fancy dress attempts a record in the TCS London Marathon on Sunday, April 27, 2025. (Photo by John Sibley/Action Images via Reuters)

A detail of the Sagrada Familia Basilica, designed by architect Antoni Gaudi, in Barcelona, Spain, Wednesday, October 21, 2015. Barcelona's breathtaking La Sagrada Familia Basilica has begun its final phase of raising six immense towers. Presenting the project Thursday, chief architect Jordi Fauli said the central "Tower of Jesus Christ," the tallest of the six, will rise 172.5 meters (566 feet) high, making it "the tallest religious building in Europe". (Photo by Manu Fernandez/AP Photo)

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)