Ferdinand Cheval was a postman in the little town of Hauterives and one day, when tripping over a rock, he decided to build his dream: an amazing and imaginary castle. Each day, while doing his mail delivery, he gathered rockes that he used to build this strange construction (24m long by 16m wide!). Cheval blended all diffrent religions with animals and plants. Every single cm² is detailed and made by one man only! It is one of the most inspiring things I have ever seen. "Où le songe devient réalité".
See also: http://www.facteurcheval.com