According to the BBC, a Viking boat appears to have been found under a pub car park in the Wirral. They are hoping to excavate it if funds can be found, but are not sure how it got there. I would have thought the answer to that is obvious. The Vikings dragged the boat along to the car park, and then went into the pub for a pint or two of mead. When they came out, they simply forgot the boat. It can happen. I am sure Arch will confirm this, seeing as how she knows a lot about archaeology, the Vikings, and drinking copious amounts of mead.