I have posted another photo album from our recent trip to Turkey and Bulgaria, on my facebook page. This features the fascinating village of Pamukkale in central Turkey. It is home to an ancient ruined city (Hierapolis) and the travertines, a hillside covered with glistening white calcite formations from the calcium rich spring water that flows over it. There is also a fascinating ancient pool, a thermal hot spring full of mineral water, that is full of broken Roman columns from the ruined former Roman baths there.
(this may look like snow, but it was 35 degrees C when this was taken! It is calcite. On top of the hill you can see one of the ruined buildings from the ancient city of Hierapolis.)