Stunning silhouettes under European cities reveal the size and splendor of the continent’s urban foundations. Photographer and content-manager Anna Arinova, 28, from Moscow, captured the awe-inspiring labyrinths in Russia and Germany. Here: Regenwurmlager, Poland. The Regenwurmlager is an extensive underground fortification area constructed by Germany in 1920s-1940s, now in western Poland, near the city of Międzyrzecz. (Photo by Anna Arinova/Caters News)

Egyptians members of the “Tanoura Dance Troupe” perform during the holy month of Ramadan, at the Ghouri complex, in Islamic Cairo, Egypt, 13 April 2022. (Photo by Khaled Elfiqi/EPA/EFE)

Revellers of street parties known as blocos, dance during a protest against restrictions by city officials in Rio de Janeiro, Brazil, Wednesday, April 13, 2022. City Hall has banned the street parties during Carnival celebrations, which were delayed by almost two months due to the pandemic. (Photo by Silvia Izquierdo/AP Photo)

Tomomi Ota pushes a trolley loaded with her humanoid robot Pepper as she crosses a street in Omotesando shopping district in Tokyo, Japan, 24 March 2016. Telecommunications and mobile phone carrier SoftBank Corp. opened a robot-staffed store where 10 Pepper humanoid robots welcome customers looking to buy a mobile phone. The store will be opened until 30 March 2016. (Photo by Franck Robichon/EPA)

A woman from a flood affected area arrives to receive food and other items distributed by the religious charity group Al-Khidmat Foundation Pakistan, in Shabqadar near Peshawar, Pakistan, Tuesday, September 13, 2022. The death toll from three months of record-breaking floods in Pakistan rose to over 1,400, officials said Tuesday, as the minister for climate warned the prolonged monsoon rains will continue lashing this impoverished nation in the coming weeks. (Photo by Muhammad Sajjad/AP Photo)

A Lion peers out of a window on Fitzwilliam Square, Dublin, Republic of Ireland on October 25, 2022. (Photo by Dara Mac Dónaill/The Irish Times)

Ocean Beach after a rain storm in San Francisco, California, US, on Thursday, January 5, 2023. A powerful storm with hurricane-force gusts has begun to wind down after ripping across California, leaving behind power outages, flood threats and road closures just hours before another drenching is set to wash over the state. (Photo by Shelby Knowles/Bloomberg)

Japanese monkeys snuggle to keep warm at a zoo in Tonosho in Kagawa Prefecture, western Japan on January 24, 2023. (Photo by Kyodo Photo via Newscom/Alamy Live News)