
The unveiling of a US$350,000 (S$527,000), 5.4m-tall sculpture, designed to promote peace, was among events held worldwide to celebrate the singer-songwriter and peace activist.
The ceremony was also attended by John Lennon's son, Julian, and first wife, Cynthia.
Technology giant Google has decided to honour Lennon by tweaking their logo to an animated doodle based on Lennon's solo song, 'Imagine'.
Meanwhile, Yoko Ono will perform a concert in Reykjavik, Iceland in Lennon's honour.