I stopped travelling a few years ago, but here's the list, that I can remember and it's not as big as I thought it was, although I've been to a fair few of these grounds more than once:
Arsenal
Reading
Wembley
Millenium Stadium
Aston Villa
Chelsea
Man Utd
Man City
Fulham
West Ham
Fulham
Crystal Palace
Wimbledon (Plough Lane)
Leyton Orient
Newcastle United
Sunderland
Liverpool
Everton
Birmingham
Portsmouth
Southampton
Plymouth
Hereford
Sheffield United
Sheffield Wednesday
Grimsby
Notts Forest
Notts County
Exeter
Derby County
Millwall (old and new)
Stoke
Leicester
Leeds
Coventry
West Brom
QPR
Norwich
Watford
Brighton (old)
Charlton
Oxford
Barnet
Luton
Maidenhead
Tooting and Mitcham
Paris St Germain
Auxerre
Parken
San Siro
Standard Liege
Benfica
PAOK Salonika
spurs
Arsenal
Reading
Wembley
Millenium Stadium
Aston Villa
Chelsea
Man Utd
Man City
Fulham
West Ham
Fulham
Crystal Palace
Wimbledon (Plough Lane)
Leyton Orient
Newcastle United
Sunderland
Liverpool
Everton
Birmingham
Portsmouth
Southampton
Plymouth
Hereford
Sheffield United
Sheffield Wednesday
Grimsby
Notts Forest
Notts County
Exeter
Derby County
Millwall (old and new)
Stoke
Leicester
Leeds
Coventry
West Brom
QPR
Norwich
Watford
Brighton (old)
Charlton
Oxford
Barnet
Luton
Maidenhead
Tooting and Mitcham
Paris St Germain
Auxerre
Parken
San Siro
Standard Liege
Benfica
PAOK Salonika
spurs