the tavertine cascades in pamukkale, turkey showing a discoloured section damaged by human activity

activity amphitheatre archaeology azure blue bowls calcium carbonate cascade cascades castle city civilisation columns cotton culture damaged denizli empire formation hierapolis human lake landmark landscape levels limestone mediterranean minerals nature pamukkale patterns pool province pure roman ruin shallow sky snowwhite spring stone summer sunshine terrace thermal tourism travertine turkey turquoise unesco upper water waterfall white wonder