It's about one-fifteenth the number of Seats in The Colosseum.
In other words, the count of Seats in The Colosseum is 10 times 3,500.(a.k.a. The Coliseum, a.k.a. Flavian Amphitheatre, a.k.a. Amphitheatrum Flavium, a.k.a. Anfiteatro Flavio or Colosseo) (Rome) (estimated)
Built between 70 and 80 AD, The Colosseum was a central attraction of Rome, capable of seating 50,000 spectators for various events including plays, war reenactments, and gladiatorial matches. The structure was estimated to require 100,000 cu. m of stone to construct. It remains the largest amphitheater in the world.
It's about one-fifteenth the number of Seats in New Yankee Stadium.
In other words, the count of Seats in New Yankee Stadium is 14.3680 times 3,500.(2014 figures for 2009 Stadium; seating figures only) (a.k.a. Yankee Stadium, a.k.a. The Stadium, a.k.a. The House that George Built) (South Bronx, New York City, New York)
It's about seventeen times the number of Bones in the Human Body.
In other words, the count of Bones in the Human Body is 0.0588 times 3,500.(adult, excluding sesamoid bones and ossicles)
It's about nineteen-and-a-half times the number of John Wayne films.
In other words, the count of John Wayne films is 0.0508 times 3,500.(a.k.a. "Duke", a.k.a. JW, a.k.a. Marion Mitchell Morrison, a.k.a. Marion Robert Morrison, a.k.a. Duke Morrison) (films starring the actor in any size role)
It's about one-twenty-fifth the number of Seats in Lambeau Field.
In other words, 3,500 is 0.043352 times the count of Seats in Lambeau Field, and the count of Seats in Lambeau Field is 23.067 times that amount.(2014 figures) (a.k.a. City Stadium, a.k.a. New City Stadium, a.k.a. Titletown USA, a.k.a. The Frozen Tundra, a.k.a. The Shrine of Pro Football) (Green Bay, Wisconsin)
It's about twenty times the number of Moons in our Solar System.
In other words, the count of Moons in our Solar System is 0.0417 times 3,500.(2015 figures) (confirmed moons only; dwarf planet satellites not included)
It's about thirty times the number of Union Stations in the United States.
In other words, 3,500 is 25.90 times the count of Union Stations in the United States, and the count of Union Stations in the United States is 0.0386 times that amount.(a.k.a. Union Terminal; a.k.a. Joint Station; a.k.a. Union Depot) (2016 figures)