You might remember NFL Europe, the developmental league where football players could get better while playing for one of the nine teams in European cities between 1998 and 2007.
The World League of American Football is where it all started with 10 teams. Founded in 1989, the WLAF combined seven teams from the U.S. and three from Europe for spring football for two seasons in 1991 and 1992. This map shows the teams that participated in that.
North American West: Birmingham Fire, Sacramento Surge, San Antonio Riders
North American East: Montreal Machine, New York/New Jersey Knights, Orlando Thunder, Raleigh–Durham Skyhawks (replaced by Ohio Glory in 1992)
European: Barcelona Dragons, Frankfurt Galaxy, London Monarchs
In 1998, the league was rebranded as NFL Europe League, or NFL Europe. The name changed to NFL Europa in 2007, the same year the league ended.