The Mystery of the Margate Shell Grotto
In 1835 a laborer in England accidentally broke through the ground into a series of subterranean chambers covered with mosaics made from seashells- millions of them. The site was purchased and turned into a tourist attra...
https://www.neatorama.com/2015/05/28/The-Mystery-of-the-Margate-Shell-Grotto/
