Few public figures have ever enjoyed the same global appeal as Muhammad Ali and few athletes have ever reverberated as strongly through history.
The legendary boxer's funeral will be held in his native Louisville, Kentucky on Friday but such is his universal impact that, it will also be beamed around the world including in London where devotees and those wishing to pay their respects can watch "The Greatest's" funeral at The O2 Arena.
The funeral will be broadcast on giant screens outside the entrance to The O2 from 7pm tonight.
People will also be invited to pay homage to the former heavyweight champion of the world by signing the Book of Condolences placed at the I Am The Greatest Muhammad Ali exhibition inside the arena.
The exhibition, which is scheduled to run until 31 August, features rare artefacts and memorabilia from throughout Ali's career and guides visitors through the incredible twists and turns of his extraordinary life.
Those not able to make it down to the O2 can also watch the funeral live on alicenter.org from 7.00pm.
Ali passed away last Friday aged 74.
Tens of thousands of people are expected to travel to Louisville to line the streets for a 90 minute procession of Ali's body through his hometown.
Ali will be laid to rest at Cave Hill Cemetary in a private ceremony before the funeral.
Actor Will Smith and former British heavyweight Lennox Lewis will be pallbearers, while former President Bill Clinton will deliver a eulogy.