Only ever seen 4 times Spanish Stonehenge 

It rises from the bottom of the reservoir from an ancient structure called Spanish Stonehenge near Madrid.

This is believed to be a prehistoric stone circle.

If it is seen, then around 5,000 BC had pleased archaeologists.

This was actually first discovered in 1926.

It was filled in 1963 by making Valencenes Reservoir.

In this the stone was fully visible only four times.

Spain is facing the worst conditions in these 60 years and the water has receded again.