A man bathes in a tub filled with Naftalan crude oil during a treatment session at Sehirli Naftalan Health Center, some 300 kilometres (186 miles) from capital Baku, on March 21, 2019. Immersed up to her neck in crude oil, a Russian woman suffering from joint disease smiles in delight, confident that the treatment at a spa in northwestern Azerbaijan will cure her painful condition. (Photo by Mladen Antonov/AFP Photo)
