As well as the film, a very good biopic of his early life, it's worth watching the documentary about him which goes beyond that time when he'd cracked it and had emerged as a smooth urbane world famous actor and Hollywood star who later married Elizabeth Taylor, although never forgetting his roots, he loved going back home to Wales. Sian Philips is one of the interviewees, in which she said something along the lines of hardly any actors came out of Wales at the time, there have been loads since, both Matthew Rhys and Michael Sheen are featured and of course Wales has given the world another great actor in Anthony Hopkins. Richard was very good looking when he was young and Elizabeth was absolutely beautiful, but so avaricious with it, she seemed addicted to acquiring jewellery. Unfortunately he was also addicted to drink, shocked to find out he downed 4 bottles of vodka a day at one time. God knows what the state of his liver was in, no wonder he poisoned himself. She meanwhile was addicted to pain killers, and although she'd had a back injury from riding during her National Velvet days as pointed out by MayBee above, it went beyond that she had multiple physical ailments, the book suggested some of them were fabricated. Their relationship had its ups and downs and was quite toxic at times, but they were an incredibly glamorous and newsworthy couple, not always in a good way. it was suggested as well as drink, they were addicted to all the publicity that surrounded them. Now of course they'd have social media, although it was almost as if they did back then such was their fame. After reading the book, I wondered, in spite of earning enormous amounts of money, if that was enough to support their extravagant lifestyle, the entourage, the artwork, the jewels, the yacht, the homes all of it. The Pope of the day when they were filming Cleopatra coined the phrase "erotic vagrant" about Elizabeth 
Richard Burton will always be remembered for his mesmerising voice, utterly unique.