Capacity: 67,000 attendants. According to wikipedia, Mineirao is today the second largest stadium in Brazil (the largest one being Maracana). Morumbi used to be the undisputed second biggest, but after successive renovations (which increase comfort and reduce seat space), the number will fall under the current 68,000 (anyway, Morumbi will not host the Cup).
However, after the Cup, Castelao Stadium, in the northeastern city of Fortaleza, can become the second largest stadium in Brazil; official informed capacity was 67,037, but the figures (neither Mineirao's nor Castelao's) don't make a clear distinction between actual attendance seatings, media seatings, VIP seatings, etc.
Official name: Estádio Governador Magalhaes Pinto. Origin of name: Jose de Magalhaes Pinto was Governor of the State of Minas Gerais between 1961 and 1966; the stadium was built during his term in office.
The stadium is much more commonly referred to as Mineirao, which means "the big Mineiro" (Mineiro is someone who's born in the State of Minas Gerais).
Belo Horizonte was one of the host cities of the World Cup 1950, but matches took place in the old Estadio Independencia, and not in Mineirao (which didn't exist at that time).
Belo Horizonte will host six matches of the World Cup, including one of the semi-finals.
In the likely event of the Brazilian team finishing first placed in the groups stage, then it will play a match in Belo Horizonte. Matches of the World Cup 2014 in Belo Horizonte:
»June 14th 2014 (Saturday):
»June 17th (Tuesday):
»June 21st (Saturday):
»June 24th (Tuesday):
»June 28th (Saturday): Round of 16
»July 8th (Tuesday): semi-final
Belo Horizonte is also confirmed as one of the host cities of the Confederations Cup Brazil, in 2013.
Matches of the Confederations Cup in Belo Horizonte:
»June 17th 2013: Tahiti x African
»June 22nd: Japan x Mexico
»June 26st: semifinal