sample of the week

our featured sample this week can be found in abundance at Pamukkale in Turkey, where it flows from hot springs to cover the landscape. precipitating from the calcite-rich rich waters when they become exposed to the atmosphere, calcium carbonate forms a type of limestone called travertine. over the eons, it has built a series of cascading cliffs and pools – used since ancient times for bathing and healing

read more about Pamukkale in our latest column for AnOther