Cemetery workers repaint tombs inside the municipal cemetery in Navotas city, north of Manila October 29, 2015. Filipinos are preparing to celebrate All Saints Day on November 1 by visiting the graves of their departed loved ones. (Photo by Ezra Acayan/Reuters)

The New World porcupine, family Erethizontidae, 1280 Gram born at 11 April 2015 Inventory in Zoo. Counting trade Fairs Weighing the Zoo is at 7 May 2015 too the 108 Birthday Zoo Hagenbeck Hamburg, Germany. (Photo by Imago/ZUMA Wire)

An instructor (C) adjusts the posture of students of flight attendant major during a training session at Anhui Foreign Languages University, in Hefei, Anhui province, China, May 25, 2015. (Photo by Reuters/China Daily)

Lazar and his sister Andjelka sit by a candle in their home in the eastern Serbian town of Majdanpek, December 4, 2014. Electricity workers in Serbia struggled through snow, ice and treacherous terrain on Thursday to restore electricity to an eastern town left shivering without power, heating or running water for a fourth day. (Photo by Marko Djurica/Reuters)

Lake Baikal is the world's oldest lake, at 25 million years (possibly older), and deepest, averaging 744.4 metres (2,442 ft).

Located in the south of the Russian region of Siberia, between Irkutsk Oblast to the northwest and the Buryat Republic to the southeast, it is the most voluminous freshwater lake in the world, containing roughly 20% of the world's unfrozen surface fresh water.

A local boy plays football on Iracema Beach on June 11, 2014 in Fortaleza, Brazil. (Photo by Robert Cianflone/Getty Images)

A woman holds a picture as people pray during a funeral, following a mass shooting at a day care centre, at Wat Rat Samakee, in the town of Uthai Sawan, in the province of Nong Bua Lam Phu, Thailand on October 9, 2022. (Photo by Jorge Silva/Reuters)

A cow carrying a bell and autumn flowers headgear walks by in front of spectators at the traditional cattle show in Schwellbrunn, Switzerland, 26 September 2022. The traditional show in the Appenzell region is held annually in autumn, when local farmers return from the alp with their groomed and cleaned cows to present them on a show ground. “The most beautiful and best performing cows are awarded prizes”, the Appenzellerland tourism office adds on their website. (Photo by Gian Ehrenzeller/EPA/EFE)