Beneath the Swedish capital lies an intricate web of underground train lines. More than 90 of the 100 stations in the 110km tunnel system, sometimes referred to as “the world’s longest art gallery”, have been decorated with paintings, installations, mosaics and sculptures by 150 artists since the 1950s. After spending a couple of weeks exploring arctic Norway and Sweden, London-based travel photographer Conor MacNeill headed underground to capture images of the metro stations. Here: A rainbow arcs over a girl on the platform of Stadion station. (Photo by Conor MacNeill/The Observer)

Swedish actress Rebecca Ferguson attends the World Premiere of “Dune: Part Two” in London's Leicester Square on February 15, 2024 in London, England. (Photo by Hannah McKay/Reuters)

Swedish actress Alicia Vikander poses during a photocall for the film “Firebrand” at the 76th edition of the Cannes Film Festival in Cannes, southern France, on May 22, 2023. (Photo by Joel C. Ryan/Invision/AP Photo)

Swedish climate change activist Greta Thunberg, Isabelle Axelsson and German Luisa Neubauer take part in a climate strike protest during the 50th World Economic Forum (WEF) annual meeting in Davos, Switzerland on January 24, 2020. (Photo by Denis Balibouse/Reuters)

Swedish-born actor Dolph Lundgren shows off his muscles by sweeping two women off their feet at the same time, 1986. (Photo by Dave Hogan/Hulton Archive/Getty Images)

Swedish music band ABBA's wax figures are displayed at the ABBA museum in Stockholm, Sweden on November 5, 2021. ABBA's first album in 40 years, “The Voyage”, was released on November 5, 2021. (Photo by Jonathan Nackstrand/AFP Photo)