I wouldn't be surprised to find a whole city existing beneath London, if ever there will be. So many things have happened throughout its history that places just get buried underneath rubble and almost forgotten until somebody digs it up, and that's exactly what a group of archaeologists did to find an ice house under the streets of central London.
How did it get there? They suggest that it had existed in the late 18th century and was covered after the area was bombed during the war. Esther Addley shares more about this discovery on The Guardian.
(Image credit: Graeme Robertson/The Guardian)