The disappearance of Prime Minister Harold Holt on 17 December 1967 remains one of Australia’s greatest mysteries.

A newsreel item from 1965 about His Royal Highness The Duke of Edinburgh, Prince Philip, opening the new Royal Australian Mint in Canberra accompanied by then Treasurer, Harold Holt.

The Australian History Timeline features over 90 film clips showcasing a unique collection of Australian history documentaries. Part 3 covers the 1950s to the 2000s.

On 20 October 1966, United States President Lyndon B Johnson arrived in Australia for the first ever Presidential visit to Australia.

Glass slide. Text reads: 'Hon. Harold Holt M.P. Minister for Labour, National Service & Immigration will speak at Cnr. Guthrie St. & Given Terrace Paddington 8 p.m Wed.

The disappearance of our seventeenth Prime Minister at Cheviot Beach sparked countless conspiracy theories and ultimately overshadowed his political accomplishments.

On 22 December 1967, only five days after his disappearance, a hastily arranged memorial service for Prime Minister Harold Holt took place at St Paul’s Anglican Cathedral in Melbourne.

In this Commonwealth Film Unit production from 1964, Federal Treasurer Harold Holt introduces Steward Devlin's designs for the new decimal coins.

This unedited, silent broadcast footage from the Nine Network shows Marjorie Gillespie walking up from the beach.

'He loved women', says Dame Zara Bates in this interview from the documentaryThe Harold Holt Mystery (Ten Network, 1985).