Much of Bulgaria's educational capacity is concentrated in Sofia. There are 221 general, 11 special and seven arts or sports schools, 56 vocational gymnasiums and colleges, and four independent colleges. The city also hosts 23 of Bulgaria's 51 higher education establishments and more than 105,000 university students. The American College of Sofia, a private secondary school with roots in a school founded by American missionaries in 1860, is among the oldest American educational institutions outside of the United States.