"A concrete tower - 40 storeys high - stood bathed in intense white light, a totally bizarre image in the depths of the Andalusian countryside.
The tower looked like it was being hosed with giant sprays of water or was somehow being squirted with jets of pale gas. I had trouble working it out."
Can you guess what it is? It's a solar-thermal power station, focusing beams of reflected sunlight to create steam to drive turbines. Read all about it on the BBC.