Parker's Piece

Parker's Piece is a 25-acre flat and roughly square green common located near the centre of Cambridge, England, regarded by some as the birthplace of the rules of association football. The two main walking and cycling paths across it run diagonally, and the single lamp-post at the junction is colloquially known as Reality Checkpoint. The area is bounded by Park Terrace, Parkside, Gonville Place, and Regent Terrace.

Source: Wikipedia