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)

Crowds supporting the Same Sеx Marriage Survey listen to politicians and advocates at Taylor Square in the heart of Sydney's gay precinct on November 15, 2017 in Sydney, Australia. Australians have voted for marriage laws to be changed to allow same-sеx marriage, with the Yes vote claiming 61.6% to to 38.4% for No vote. Despite the Yes victory, the outcome of Australian Marriage Law Postal Survey is not binding, and the process to change current laws will move to the Australian Parliament in Canberra. (Photo by James Alcock/Getty Images)

A tourist train is decorated with Christmas lights in Bogotá, Colombia on December 10, 2017. (Photo by Jaime Saldarriaga/Reuters)

UEFA staff member carry away the trophy from the pitch prior the UEFA Champions League semi-final football match between Leipzig and Paris Saint-Germain at the Luz stadium in Lisbon on August 18, 2020. (Photo by David Ramos/Pool via AFP Photo)

A man dressed as a bear and wearing a protective face mask amid the outbreak of the coronavirus disease (COVID-19) stands in front of a fountain in central Kyiv, Ukraine on August 11, 2020. (Photo by Valentyn Ogirenko/Reuters)

Palestinian athlete Ahmed Abu Hasira demonstrates his parkour skills during a lockdown amid the coronavirus disease (COVID-19) outbreak in Gaza City on September 8, 2020. (Photo by Mohammed Salem/Reuters)

Mariana Sousa, student of the Ballet Paraisopolis, warms up during a rehearse in Paraisopolis favela, outskirts of Sao Paulo, Brazil on August 27, 2020, amid the new coronavirus COVID-19 pandemic. The 200 ballet students of Paraisopolis, the second largest favela in Sao Paulo, restarted rehearsals after five months with a coreography about a police operation that put their community in mourning last year. (Photo by Nelson Almeida/AFP Photo)

A woman wearing a protection face mask walks past a mural of a dog in Shanghai, China, 03 September 2020. Daily life in Shanghai is returning to normal while many people still wear protection masks on the street, which are still mandatory in many shopping malls and other public places. (Photo by Alex Plavevski/EPA/EFE)