Although the earliest historical records of Copenhagen are from the end of the 12th century, recent archaeological finds in connection with work on the city's metropolitan rail system revealed the remains of a large merchant's mansion near today's Kongens Nytorv from c. 1020. Excavations in Pilestræde have also led to the discovery of a well from the late 12th century. The remains of an ancient church, with graves dating to the 11th century, have been unearthed near where Strøget meets Rådhuspladsen.