Off the top of my head
Been to all current league grounds in Scotland plus 10 highland league, 12 in the lowland league, 5 in the east of Scotland league, 19 in the East Juniors, 11 in the North Juniors and 2 in the West Juniors. Also seen football at Murrayfield.
In England been to 27 grounds including Wembley
4 in Wales including Cardiff Arms
4 in the Republic including Aviva
1 in Austria
4 in France including the Stade de France
5 in Germany including Olympic Stadium in Berlin and Westfalen in Dortmund and Allianz Arena in Munich
6 in Czech Republic including both Slavia and Sparta grounds in Prague
5 in Holland including the Amsterdam Arena
2 in Belgium
4 in Italy including the San Siro
2 in Slovenia
1 in Poland
1 in Croatia
1 in Serbia
1 in Lithuania
1 in Georgia
2 in Ukraine
1 in Slovakia
2 in Sweden including the Ullevi in Gothenburg
2 in Norway
3 in Denmark
2 in Malta
5 in Spain
1 in Cyprus
1 in Macedonia
1 in Iceland
6 in the US
Most impressive facility wise was the Levi's stadium in Santa Clara in the US best for atmosphere is between the stadiums in Munich, Dortmund and Berlin.
Most disappointing would be Wembley and the Emirates.
Sure there are a few I have forgotten.