The city is home to a number of large sports venues, including the 43,000-seat Vasil Levski National Stadium which hosts international football matches, as well as Balgarska Armia Stadium, Georgi Asparuhov Stadium and Lokomotiv Stadium, the main venues for outdoor musical concerts. Armeets Arena holds many indoor events and has a capacity of up to 19,000 people depending on its use. The venue was inaugurated on 30 July 2011, and the first event it hosted was a friendly volleyball match between Bulgaria and Serbia. There are two ice skating complexes — the Winter Sports Palace with a capacity of 4,600 and the Slavia Winter Stadium with a capacity of 2,000, both containing two rinks each. A velodrome with 5,000 seats in the city's central park is undergoing renovation. There are also various other sports complexes in the city which belong to institutions other than football clubs, such as those of the National Sports Academy, the Bulgarian Academy of Sciences, or those of different universities. There are more than fifteen swimming complexes in the city, most of them outdoor. Nearly all of these were constructed as competition venues and therefore have seating facilities for several hundred people.