the empty tavertine cascades in pamukkale, turkey and a man-made channel formed to repair damage to the formation

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