Olympiacos is a Greek professional football club based in Piraeus, Attica. Their home ground is the Karaiskakis Stadium, a 32,115-capacity stadium in Piraeus. Founded on 10 March 1925, the club is the most successful club in Greek football history, having won 47 League titles, 28 Cups (18 Doubles) and 4 Super Cups, all records. Τotalling 79 national trophies, the franchise is 9th in the world in total titles won by a football club. Having won the 2014–15 League title, Olympiacos became the only football club in the world to have won a series of five or more consecutive championships for five times in their history. They are also the only Greek club to have won five consecutive national Cups (1957–1961) as well as six League titles undefeated. In European competitions, their best performances are their presence in the UEFA Champions League quarter-finals in 1998–99. They won the Balkans Cup in 1963, at a time when the competition was considered the second most important in the region after the European Cup, becoming the first ever Greek club to win an international competition.