Tourists visit an art installation of colorful umbrellas on November 10, 2022 in Nanjing, Jiangsu Province of China. (Photo by VCG/VCG via Getty Images)

American actress and singer Vanessa Hudgens in the first decade of December 2022 decks herself out in Michael Kors. (Photo by vanessahudgens/Instagram)

Revelers take part in SantaCon in New York City, U.S., December 10, 2022. (Photo by David “Dee” Delgado/Reuters)

English and Albanian singer-songwriter Dua Lipa in the second decade of December 2022 channels Catwoman in leather. (Photo by dualipa/Instagram)

American actress Alexandra Daddario goes skinny dipping on vacation in the last decade of December 2022. (Photo by alexandradaddario/Instagram)

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.

Zoi Karangelou of Greece compete in the Women's Solo Technical final on day one of World Aquatics Artistic Swimming World Cup Super Final 2025 at Xi'an Olympic Sports Centre on June 13, 2025 in Xi An, China. (Photo by Lintao Zhang/Getty Images)

A man dressed as a zombie poses during the Thrill The World 2009 event, which sees fans from all over the world dance simultaneous to Michael Jackson's “Thriller” at Luna Park on October 25, 2009 in Sydney, Australia. (Photo by Brendon Thorne/Getty Images)