I have hit:
1) FC Frisco
2) Austin FC (USMNT)
3) LA Galaxy
4) LAFC
Missed out on Portland a decade ago because I missed my flight.
Saw the outside of the new Columbus Crew stadium as it was being finished up in 2022.
Saw the outside of Denver stadium when I attended a lacrosse tournament to visit with some parents of a player.
May have seen the outside of Foxboro in 2002 when taking a bus from Logan Airport to Providence, RI.
Definitely saw MLS games at the Cotton Bowl (Dallas Burn) & the Rose Bowl (Dallas Burn vs LA Galaxy playoffs ~1998).
TOTAL:
6 MLS stadiums attended
4 current MLS stadiums attended
3 current MLS stadium exteriors viewed, but no games attended.
ARGENTINA:
Stadiums attended for soccer (club or national team)/ rugby/ rock concerts/ tour of stadium & Diego Maradona museum
7: Boca Jrs, River Plate, Velez-Sarsfield, Racing, Independiente, Argentina Jrs, & GEBA
2 exteriors: Nueva Chicago & Rosario Central (Di María’s boyhood club)
BRAZIL:
Maracanã in Rio de Janeiro
Avai Futebol Stadium of Florianopolis
MEXICO:
Estadio Azteca
THE NETHERLANDS:
ArenA (Ajax Amsterdam)
GERMANY:
Olympic Stadium (Hertha Berlin in 2000, before the remodel for the 2006 World Cup)
SPAIN:
Camp Nou (just for a tour in 2017)
Real Sociedad stadium exterior only (San Sebastián in 2019)
IRELAND:
Croke Park (Dublin- just the exterior after walking with fans before the England v Ireland 6 Nations match in 2007)