Motor sport fans around the world mark the 20th anniversary of the death of one of Formula One’s greatest ever drivers, Ayrton Senna. Friends and family hold a memorial service at the Imola race track for Senna and Roland Ratzenberger, the other driver killed on what is known as one of the darkest weekends of racing in the sport’s history. In Senna’s home country of Brazil, Corinthians of São Paulo and even an airline pay tribute to one of Brazil’s most iconic sportsmen.