A spa is a location where a mineral spring is used to give medicinal baths with health-giving properties. Spas are popular worldwide and it is no exception in Asia. Individual spas have their own properties and features. The highly customizable experience that can be offered and clear health benefits contribute to the high interest in spas.  AFT takes a look at its list of the top ten world-class and unique spas that have captured the imagination and attention of spa-goers. Banyan Tree, Phuket, Thailand Located in Phuket is the flagship of Banyan Tree, a worldwide operator of 70 spas. Banyan Tree is a benchmark spa in Asia that has been…