The football season doesn’t begin for a while, but here’s a look at the massive concrete-and-steel behemoths where the magic happens.

• Green Bay is the smallest city to have an NFL team. The population of the city: about 105,000. Its stadium, Lambeau Field, has the fourth-largest capacity in the NFL—80,978. That means about 77 percent of the entire population of Green Bay could fit inside Lambeau Field.

• Vatican City, Nauru, Tuvalu, Palau, and San Marino are the five least populous independent nations on Earth. They have a combined population of 75,656. There are 22 stadiums for college football teams in the U.S. that could each hold more people than that.

• The largest stadium in college football: Michigan Stadium, in Ann Arbor, home to the University of Michigan. It seats 109,901. That’s roughly the population of Fargo, North Dakota. The smallest stadium in major college football: the Kibbie Dome in Moscow, Idaho. The University of Idaho plays to just 16,000 fans there.

• Los Angeles is the largest city in the U.S. without an NFL team—the Raiders and Rams left for Oakland and St. Louis, respectively, in 1995. There are still four stadiums in the area big enough to support a pro football team: Angel Stadium (45,050), Los Angeles Memorial Coliseum (93,507), Dodger Stadium (56,000) and the Rose Bowl (92,542). And yet if a team moves to L.A.…somebody will still spend billions to build a new facility. Rams owner Stan Kroenke is reportedly considering a move back to L.A., and he owns a 60-acre plot of land there.

• Two teams in the NFL share a stadium. The New York Giants and the New York Jets both play at MetLife Stadium…which isn’t even in New York City, or New York state. It’s in East Rutherford, New Jersey.