There is no special national football stadium in germany. The stadiums/cities for games of the national team change.
The home stadium of the Switzerland national football team is the Stade de Suisse located in Bern, Switzerland
The tenant of Vasil Levski National Stadium is Bulgaria national football team.
The tenant of Bukit Jalil National Stadium is Malaysia national football team.
Kim il Sung Stadium
The Toyota stadium. I'm not 100% sure.
The tenant of Wembley Stadium is the England national football team.
The tenant of Lithuania National Stadium is Lithuania national football team in Lithuania and it is under construction.
The biggest football stadium in the world is the "Rungrado May Day Stadium", which is the national stadium of the North Korean football team which holds 150,000