Revelers around the globe are bidding a weary farewell Monday, Dec. 31, to an unsettling year filled with challenges to many of the world's most basic institutions, including politics, trade, alliances and religion.
Here's a look at how people are ushering in 2019.
Puerta del Sol rings in the new year in Madrid, Spain, Tuesday, Jan. 1, 2019.
People welcome the new year on Zakopane, Poland, Tuesday, Jan 1.
A woman prays in front of a wall of lanterns to celebrate the New Year at the Jogyesa Buddhist temple in Seoul, South Korea, Monday, Dec. 31.
Revellers take selfies during a New Year's Eve rehearsal celebration in Madrid, Spain on Monday, Dec. 31.
Fireworks explode over the Sydney Harbour during New Year's Eve celebrations in Australia, Tuesday, Jan. 1, 2019.
Worshippers pray as they take turns lying in coffins during a ceremony at the Takien temple in Bangkok, Thailand, Monday, Dec. 31. Worshippers believe that the ceremony, which symbolizes death and rebirth, helps to rid themselves of bad luck and give them a fresh start in the new year.
Fireworks explode over the Arc de Triomphe at the Champs Elysees in Paris, Tuesday, Jan. 1, 2019.
Fireworks illuminate the sky near the Erasmus Bridge in Rotterdam, The Netherlands, Tuesday, Jan. 1.
Revellers celebrate the new year in Vorosmarty Square in Budapest, Hungary, Tuesday, Jan. 1, 2019.
Fireworks explode from Auckland's Sky Tower in New Zealand, Tuesday, Jan 1. 2019.
Runners start the Sao Silvestre race in Sao Paulo, Brazil, Monday, Dec. 31. The 15-kilometer race is held annually on New Year's Eve.
Fireworks explode over the Victoria Harbor during New Year's Eve to celebrate the start of year 2019 in Hong Kong, Tuesday, Jan. 1, 2019.
Fireworks explode in front of Malaysia's landmark building, the Petronas Twin Towers, during the New Year's celebration in Kuala Lumpur, Malaysia, Tuesday, Jan. 1, 2019.
Pope Francis kisses a statue of Baby Jesus as he celebrates a new year's eve vespers Mass in St. Peter's Basilica at the Vatican, Monday, Dec. 31, 2018.
Performers cheer after a countdown to the new year event in Beijing, China, Tuesday, Jan. 1, 2019.