In the Australian city of Sydney, more than an estimated one million people gathered to watch a spectacular fireworks display in the harbour. Samoa, the tiny pacific island was the first country to welcome in 2018, with New Zealand following an hour later.
Thousands of people lined the streets near Seoul's City Hall for a traditional bell-tolling ceremony, followed by an impressive fireworks display to usher in the new year.
"It's particularly special this year, the Sky Tower's 20th birthday year", he said.
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Revelers were treated to a fine display in Auckland on Sunday night into Monday morning before Australia saw in the New Year two hours later. To welcome the new year in Mumbai, the city's historic buildings are decorated with colorful lights.
In Japan, people celebrated the arrival the of the Year of the Dog, eating New Year's food such as noodles, shrimp and sweet black beans and praying for peace and good fortune.
Many cities around the world have stepped up security for New Year's Eve celebrations, especially looking at the major terror attacks around the world.