When archaeologists were called to investigate a sinkhole that opened up in the city of York, they were surprised to find traces of a medieval hospital, according to a report by The Independent. The team encountered walls hidden just beneath the city streets that they believe once belonged to the twelfth- or thirteenth-century St. Leonard's Hospital. The institution was built just after the Norman conquest and replaced the earlier St. Peter's Hospital, which was founded by the Anglo-Saxon King Aethelstan. Stretching from what is now York's Museum Gardens to the Theatre Royal, St. Leonard's was one of the largest hospitals...