Rules of the Game: During penalty kicks to determine the winner of a match, all players, except the player taking the kick and the two goalkeepers, must remain within the center circle.
Goalkeeper is the only position to be explicitly part of the rules of the game since they were codified in the 19th century.
Italy's famous 82,955-seat San Siro stadium is home to both AC Milan and Inter Milan. The two team's played each other in the ground's first game in 1926.
Columbus Crew Stadium, which opened in 1999, was the first stadium in the US built specifically for a MLS team. It has a seating capacity of 22,500.
The United States played its first-ever official international soccer match on August 20, 1916 against Sweden in Stockholm.