Shell Grotto at Margate (UK) In 1835 Mr James Newlove lowered his young son Joshua into a hole in the ground that had appeared during the digging of a duck pond. Joshua emerged describing tunnels covered with shells. He had discovered the Shell Grotto;
Ferdinand Cheval was a French postman who spent thirty-three years of his life building Le Palais idéal (the "Ideal Palace") in Hauterives. The Palace is regarded as an extraordinary example of naïve art architecture.