We are bang slap in the middle of nowhere, up a creek without a paddle and being urged violently to do a U-Turn where possible as we follow the World's Worst Map. Alongside us is historian Seb Falk who talks us through the weird and wonderful places and things to be found in the Hereford Mappa Mundi. Ben takes us wandering in the Mountains of Kong (spoiler: they don't exist) and Barry finds a map of a square and stationary Earth!