This is the biggest sink hole I have ever seen – Obruk Han Gölü, doline (sinkhole) behind the old caravansary near Cappadocia.
We came across this sink hole while we were near a medieval dwelling for the travelling merchants in Turkey.
It was so big that it filled the whole of the photo, despite zooming out to the fullest.
If you look carefully, near to the bottom of the edge of the hole stood a couple of people and there was a flock of white birds flying in the air against the water in the sink hole.
A magnificent view!
retireediary 