The List

As suggested by our friends over at The djl Zone, I will list all the stadiums/arenas/venues in which I've seen a sporting event. There's a good chance I'm forgetting a few. Here they are, in no particular order within the sport types.

MLB
Candlestick Park (San Francisco)
Dodger Stadium (Los Angeles)
Royals/Kauffman Stadium (Kansas City)
Busch Stadium (St. Louis)
County Stadium (Milwaukee)
(Old) Comisky Park (Chicago)
Wrigley Field (Chicago)
Tiger Stadium (Detroit)
Riverfront Stadium (Cincinnati)
Municipal Stadium (Cleveland)
Jacobs Field (Cleveland)
Three Rivers Stadium (Pittsburgh)
Olympic Stadium (Montreal)
Fenway Park (Boston)
Yankee Stadium (New York)
Memorial Stadium (Baltimore)
Vererans Stadium (Philadelphia)
Fulton County Stadium (Atlanta)
Turner Field (Atlanta)

MiLB
City Island Park (Daytona Beach)
Thurman Munson Stadium (Canton)
Cooper Stadium (Columbus)
Joe Davis Stadium (Huntsville)
Greer Stadium (Nashville)

NFL
Municipal Stadium (Cleveland)
Fawcett Stadium (Canton)
Riverfront Stadium (Cincinnati)
Browns Stadium (Cleveland)

CFL
BC Place (Vancouver)
Commonwealth Stadium (Edmonton)
Canad Inns/Winnipeg Stadium (Winnipeg)
Memorial Stadium (Baltimore)
Ivor Wynne Stadium (Hamilton)
SkyDome (Toronto)

USFL
Tampa Stadium (Tampa)
Giants Stadium (New Jersey)

WLAF
Legion Field (Birmingham)

Arena/Indoor Football
Nationwide Arena (Columbus)
Civic Arena (Pittsburgh)
Civic Center (Canton)

College Football
Doyt Perry Stadium (Bowling Green)
Ball State Stadium (Muncie)
Dix Stadium (Kent State)
Rubber Bowl (Akron)
Yager Stadium (Miami)
Ohio Stadium (Ohio State)
Spartan Stadium (Michigan State)
Pitt Stadium (Pittsburgh)

NBA
Richfield Coliseum (Cleveland)

ABL - American (Women's) Basketball League, 1996-1998
Battelle Hall (Columbus)

College Basketball
St. John Arena (Ohio State)
Value City Arena (Ohio State)
Savage Hall (Toledo)
MAC Center (Kent State)

Women's College Basketball
St. John Arena (Ohio State)

NHL
Richfield Coliseum (Cleveland - exhibition between Pittsburgh Penguins and US Olympic team)
Civic Arena (Pittsburgh)
Nationwide Arena (Columbus)

Minor League Hockey
Fairgrounds Coliseum (Columbus)
Von Braun Civic Center (Huntsville)
Gund Arena (Cleveland)

College Hockey
University Ice Arena (Kent State)
Value City Arena (Ohio State)
Bradley Center (Milwaukee-Frozen Four)

MLS
Crew Stadium (Columbus)

Indoor Soccer
Civic Center (Canton)
Richfield Coliseum (Cleveland)
Convention Center (Dayton)
Fairgrounds Coliseum (Columbus)

College Lacrosse
Ohio Stadium (Ohio State)

Pro Indoor Lacrosse
Nationwide Arena (Columbus)

Club Lacrosse (only "interesting" venues listed)
Bobby Dodd Stadium (Atlanta)
Neyland Stadium (Knoxville)
The University of the South (Sewanee, TN -- what's the stadium name?)
Glass Bowl (Toledo)

College Fencing
Larkins Hall (Ohio State)

Australian Rules Football
Telstra Dome (Melbourne)