(Photo: Adhara Caamaño)This is a hórreo. It's a structure that can be found throughout western and southern Europe, but is most common in Spain. It's a building built on stone columns. Some have stood for 2,000 years.Why did people build these architectural oddities?(Photo: alamanos)They were barns where farmers kept harvested crops. Here's one of a few hórreos still in use. Originally, a farmer would use only the top portion to store food. The stone columns kept crops out of th...