Question: The 1986 VFL Grand Final and the 2017 AFL Grand Final were both played where?

Context paragraphs:
1948 VFL Grand Final: The 1948 VFL Grand Final was an Australian rules football game contested between the Melbourne Football Club and Essendon Football Club, held at the Melbourne Cricket Ground on 2 October 1948.  It was the 52nd annual Grand Final of the Victorian Football League, staged to determine the premiers for the 1948 VFL season.  The match, attended by 86,198 spectators, ended in a draw, the first time that a VFL Grand Final had ended in a draw.  A week later in the Grand Final replay, attended by 52,226 spectators, Melbourne easily defeated Essendon by 39 points, marking that club's sixth premiership victory.

1937 VFL Grand Final: The 1937 VFL Grand Final was an Australian rules football game contested between the Geelong Football Club and Collingwood Football Club, held at the Melbourne Cricket Ground in Melbourne on 25 September 1937.  It was the 41st annual Grand Final of the Victorian Football League, staged to determine the premiers for the 1937 VFL season.  The match, attended by a then record crowd of 88,540 spectators, was won by Geelong by a margin of 32 points, marking that club's third premiership victory and first since winning the 1931 VFL Grand Final.

1938 VFL Grand Final: The 1938 VFL Grand Final was an Australian rules football game contested between the Carlton Football Club and Collingwood Football Club, held at the Melbourne Cricket Ground in Melbourne on 24 September 1938.  It was the 42nd annual Grand Final of the Victorian Football League, staged to determine the premiers for the 1938 VFL season.  The match was won by Carlton by a margin of 15 points, marking that club's sixth premiership victory and first since winning the 1915 VFL Grand Final.

2017 AFL finals series: The 2017 Australian Football League finals series was the 121st annual edition of the VFL/AFL final series, the Australian rules football tournament staged to determine the winner of the 2017 AFL Premiership season.  The series ran over four weekends in September 2017, culminating with the 2017 AFL Grand Final at the Melbourne Cricket Ground on 30 September 2017.

2017 AFL Grand Final: The 2017 AFL Grand Final was an Australian rules football game contested between the Adelaide Crows and the Richmond Tigers, held at the Melbourne Cricket Ground on 30 September 2017.  It was the 121st annual Grand Final of the Australian Football League (formerly the Victorian Football League), staged to determine the premiers of the 2017 AFL season.  Richmond defeated Adelaide by 48 points, marking the club's eleventh premiership, their first since 1980.  Richmond's Dustin Martin won the Norm Smith Medal as the best player on the ground.  The match was attended by 100,021 people, the highest crowd since the 1986 Grand Final.

2016 AFL Grand Final: The 2016 AFL Grand Final was an Australian rules football match contested between the Sydney Swans and the Western Bulldogs .  It was the 120th annual Grand Final of the Australian Football League (formerly the Victorian Football League), staged to determine the premiers of the 2016 AFL season.  It was the Swans' fifth grand final appearance since 2005, while the Bulldogs were competing in their first grand final since 1961.  The match, played at the Melbourne Cricket Ground in front of 99,981 spectators, was won by the Bulldogs by a margin of 22 points, marking their second VFL/AFL premiership victory and first since 1954, breaking a 62-year premiership drought.  It was also the first time in VFL/AFL history that a team won the premiership from seventh place on the ladder.  Jason Johannisen of the Bulldogs was awarded the Norm Smith Medal as the best player on the ground.

1939 VFL Grand Final: The 1939 VFL Grand Final was an Australian rules football game contested between the Melbourne Football Club and Collingwood Football Club, held at the Melbourne Cricket Ground in Melbourne on 30 September 1939.  It was the 43rd annual Grand Final of the Victorian Football League, staged to determine the premiers for the 1939 VFL season.  The match, attended by 78,110 spectators, was won by Melbourne by a margin of 53 points, marking that club's third premiership victory and first since winning the 1926 VFL Grand Final.

2007 AFL Grand Final: The 2007 AFL Grand Final was an Australian rules football game contested between the Geelong Football Club and the Port Adelaide Football Club, held at the Melbourne Cricket Ground in Melbourne on 29 September 2007.  It was the 111th annual Grand Final of the Australian Football League (formerly the Victorian Football League), staged to determine the premiers for the 2007 AFL season.  The match, attended by 97,302 spectators, was won by Geelong by a margin of 119 points, the biggest in VFL/AFL Grand Final history.  The victory marked Geelong's seventh premiership win, and ended its 44-year premiership drought.

1963 VFL Grand Final: The 1963 VFL Grand Final was an Australian rules football game contested between the Geelong Football Club and Hawthorn Football Club, held at the Melbourne Cricket Ground in Melbourne on 5 October 1963.  It was the 67th annual Grand Final of the Victorian Football League, staged to determine the premiers for the 1963 VFL season.  The match, attended by 101,209 spectators, was won by Geelong by a margin of 49 points, marking that club's sixth premiership victory and first since winning the 1952 VFL Grand Final.

1986 VFL Grand Final: The 1986 VFL Grand Final was an Australian rules football game contested between the Hawthorn Football Club and the Carlton Football Club.  The game was played at the Melbourne Cricket Ground (MCG) in Melbourne on 27 September 1986.  It was the 90th annual grand final of the Victorian Football League (VFL), staged to determine the premiers for the 1986 VFL season.  The match, attended by 101,861 spectators, was won by Hawthorn by a margin of 42 points, marking that club's sixth premiership victory.

Supporting paragraphs: 2017 AFL Grand Final 1986 VFL Grand Final
Answer: Melbourne Cricket Ground