Football Club Internazionale Milano, commonly referred to as Internazionale or simply Inter, and colloquially known as Inter Milan outside of Italy, is a professional Italian football club based in Milan, Lombardy. The club have played continuously in the top tier of the Italian football league system since its debut in 1909. Inter have won 30 domestic trophies, including eighteen league titles, seven Coppa Italia and five Supercoppa Italiana. From 2006 to 2010, the club won five successive league titles, equalling the all-time record. They have won the Champions League three times: two back-to-back in 1964 and 1965 and then another in 2010. Their latest win completed an unprecedented Italian seasonal treble, with Inter winning the Coppa Italia and the Scudetto the same year. The club has also won three UEFA Cups, two Intercontinental Cups and one FIFA Club World Cup. Inter's home games are played at the San Siro stadium (cap. 80,018), also known as the Stadio Giuseppe Meazza. Shared with rivals A.C. Milan, the stadium is the largest in Italian football. The local team A.C. Milan are considered among their biggest rivals, and matches between the two teams, known as the Derby della Madonnina, are one of the most followed derbies in football. As of 2010, Inter is the second-most supported team in Italy, and the sixth most-supported team in Europe. The club is one of the most valuable in Italian and world football. It was a founding member of the now-defunct G-14 group of Europe's leading football clubs.