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)

A view of one of the dioramas contained inside iron boxes as part of the “S.A.C.R.E.D” installation by Chinese artist Ai Weiwei during a media preview at the cathedral in Cuenca, Spain, July 21, 2016. Ai Weiwei has reproduced scenes of his incarceration for a new art installation, a series of almost life-size dioramas – encased in steel boxes – showing his life in jail. (Photo by Susana Vera/Reuters)

The supermoon rises behind Glastonbury Tor on September 27, 2015 in Glastonbury, England. Tonight's supermoon, so called because it is the closet full moon to the Earth this year, is particularly rare as it coincides with a lunar eclipse, a combination that has not happened since 1982 and won't happen again until 2033. (Photo by Matt Cardy/Getty Images)

Nguyen Manh Quan (top), 26, a civil servant, carries a girl using his throat area as he performs during a showcase of the traditional Thien Mon Dao kung fu at Du Xa Thuong village, southeast of Hanoi, Vietnam May 10, 2015. Thien Mon Dao, a traditional Vietnamese martial art, was formed by 18th century villagers in Du Xa Thuong village, who believed the art form could help improve health as well as fight against foreign invaders. There are currently about 3,000 practitioners including farmers, industry workers and state servants. These practitioners say they are able to bend metal against their bodies and carry heavy objects using their throats, eyes or tongues, as well as run across the surface of a river, according to Thien Mon Dao kung fu master Nguyen Khac Phan. (Photo by Reuters/Kham)

Members of the contemporary circus company Cirk La Putyka perform in front of sculpture of Franz Kafka's head to entertain local residents in Prague, Czech Republic, 21 April 2020. The aim of the Cirk La Putyka events in the streets of Czech capital is to get live art back to people during the lockdown. According to them, when people can't go to the artists, to the theater, the actors go to the people. The Czech government has imposed a lockdown in an attempt to slow down the spread of the pandemic COVID-19 disease caused by the SARS-CoV-2 coronavirus. (Photo by Martin Divisek/EPA/EFE/Rex Features/Shutterstock)

“I was born in the United States in 1985. As early as I can remember I’ve been a “doodler”. From even the early days I’ve always loved strange, offbeat, beautiful, and slightly melancholy things. Something about the mixed grabbed me. My love for sketching carried on throughout my high school days. Which is when I took a small class on watercolor. Watercolor is what birthed my passion for mixing colors and how a color can tell a story. In year 2009 I discovered digital painting and my new found passion for the medium. It’s been the favored medium for the past years since. I’ve used online tutorials and videos to help me learn along the way and then in late 2011 I took a workshop called Becoming a Better Artist. The beginning of 2013 I won a class from The Art Department which will start this spring.”

“As is probably stated somewhere in the theory of infinity, if you give an infinite amount of monkeys an infinite number of old-timey Polaroid cameras, one will eventually take “artistic” blurry photos of historical sites in Moscow which will then be auctioned at Sotheby's for an estimated $75,000 – $100,000. Fortunately for every simian art fan with a spare $100k, we are currently living in the very universe in which that concept is reality. Eighteen photographs by – and of – Mikki The Chimpanzee are going to auction on June 5, 2013”. – Callie Beusman via Jezebel.com. (Photo by Guzelian)

“Microscope images forge an extraordinary bond between science and art, said Hidenao Tsuchiya, Olympus America's Vice President and General Manager for the Scientific Equipment Group. We founded this competition to focus on the fascinating stories coming out of today's life science research laboratories. The thousands of images that people have shared with the competition over the years reflect some of the most exciting work going on in research today – work that can help shed light on the living universe and ultimately save lives. We look at BioScapes and these beautiful images as sources of education and inspiration to us and the world”. – OlympusBioScapes

Photo: Pretarsus of the third leg of a female drone fly (Eristalis tenax), ventral view, by Dr. Jan Michels, Institute of Zoology, Christian-Albrechts-University of Kiel, Germany. (Photo by Olympus BioScapes)