ancient roman ruins of hierapolis (turkey) next to the natural hot springs of pamukkale. necropolis. circular graves

turkey turquish pamukkale pammukale pamukale water thermal thermalism hot roman romans ancient old ruin ruins hierapolis heritage turquia turco aguas termal termales therms termas antiguo antigua ruinas ruina baños pool pools natural nature piscina piscinas caliente istanbul istambul estambul baths bath white blanco cotton castle terraces next springs necropolis circular graves