The Trufa House
This definitely has to be the one of the most surreal houses that I have ever seen. It is called the Trufa House (Truffle) designed by Anton García-Abril. It was made by pouring concrete over bales of hay. Once the concrete was hardened it was unearthed and cut open and then a cow named Paulina was allowed to eat the leftover hay over the course of a year which helped to create the shape of the structure. Its pretty mind blowing to say the least.
You can watch a film of the Trufa House here although, I am sad to say there is no footage of the cow Paulina eating the hay.