The Newport Mystery Tower is a three-story stone structure that stands in Newport, Rhode Island. There are numerous peculiarities to its construction, strange markings and mysteries concerning who exactly built it. There is no record of its construction, the tower seeming to have been there already when colonists first arrived. Speculation about its builders runs to the Norse, the Swedes and even the Chinese. It is built of stone mortared with a mixture of crushed seashells, sand and water.