In the 18th and 19th centuries, mudlarks were people who sifted through the mud on the banks of the River Thames to find things of value. Ted Sandling keeps the dream alive. He compiled his curious collection in a book, London in Fragments: A Mudlark's Treasures, and you can also follow his finds on Instagram. If you're inspired to dig yourself, new laws require mudlarkers (and metal detector users) to apply for a permit first and then report any treasures you uncover to the authorities.