Last Saturday was Christmas Day, the day set aside by Christian faithful to celebrate the birth of Jesus Christ in Bethlehem over 2,000 years ago. Christianity remains the largest religion in the world, with over 2 billion adherents across the globe. Christmas is celebrated in many ways by those followers, and even more ways by those who enjoy the larger, more secular traditions surrounding the modern holiday. Collected here are some glimpses of this year's Christmas observations and celebrations around the world. Members of the Berlin Seals (Berliner Seehunde) swimming club take a dip in icy Orankesee lake during their traditional Christmas Day ice swim on December 25, 2010 in Berlin, Germany. Club members claim a brief dip inthe chilly waters is healthy and improves blood circulation in the body. A Hindu man has his forehand painted with a message in Hindi "Happy Christmas" on the river banks of the Ganges river on the eve of Christmas, in the northern Indian city of Allahabad. Franky Lewis from Bondi heads out for a surf at Bondi Beach on December 25, 2010 in Sydney, Australia.