The Champions League final sees city rivals Real Madrid and Atletico Madrid clash in Milan, but it's not the first time a pair of rivals have met. Here, we look at 10 other occasions.
10) Liverpool vs. Nottingham Forest
Fans still sing about their hatred of Nottingham Forest at Anfield to this day. Forest, having not been in the top flight since 1999, are no longer rivals on the pitch but back in the late 1970s, when Liverpool were at their peak, they were a significant thorn in their side. In 1978-79, Liverpool were defending back-to-back European champions and Forest had just won the domestic title. Much to the annoyance of both teams, they were drawn against each other in the first round of the European Cup. Forest won the first leg 2-0, with goals from youngster Garry Birtles and full-back Colin Barrett, then held on for a 0-0 draw in the second thanks to a miraculous performance by Peter Shilton in goal. After winning the two European Cups, Forest faded, but for a short while this rivalry burned fiercely.
9) Arsenal vs. Chelsea
In the days before Claudio Ranieri was a Premier League-winning manager with Leicester, he was a man trying to keep his job at the newly-monied Chelsea. He was never going to survive for long, as Roman Abramovich sought a more glamourous boss, but he nearly made it very hard to sack him with his run in the Champions League. Chelsea faced an Arsenal side on their way to an unbeaten league season in the quarterfinals in 2004, and the Gunners were favourites. Arsenal took a 1-1 first leg draw back to Highbury, but despite taking the lead through Jose Antonio Reyes, Frank Lampard equalised and Wayne Bridge popped up in the 87th minute to slide a winner home for the Blues.
8) Real Madrid v Valencia
You wouldn't necessarily consider Real Madrid and Valencia to be the biggest of rivals, but around the turn of the century Los Che became more than a stone in the shoe of Spain's established giants. The club, under Hector Cuper, had already made short work of Barcelona on the way to the 2000 Champions League final, where they would face Real -- the first ever final between two clubs from the same country. Alas for the underdogs, Real won with relative ease, Fernando Morientes opening the scoring, before a Steve McManaman volley and a clincher from Raul secured a 3-0 victory.
7) Chelsea vs. Manchester United
Not a historical rivalry, but one that has simmered in the last few years as Chelsea became a serious power in English football thanks to Abramovich's millions. The two sides faced each other in the UCL's 2011 quarterfinal, United winning 3-1 on aggregate, but of course the most famous European encounter was the 2008 final in Moscow. Cristiano Ronaldo's header put United in the lead, before Frank Lampard levelled just before half-time, then in extra-time Didier Drogba was sent off but nobody could break through and penalties were required. Ronaldo had his kick saved by Petr Cech, which set up a chance for John Terry to win it with Chelsea's final penalty, but he slipped and hit the post. Edwin van der Sar's save from Nicolas Anelka then gave United the trophy.
6) Juventus vs. Milan
The bigger Turin-Milan rivalry is actually between Juve and Inter, but, surprisingly, those two have never faced each other in Europe's top competition. Juventus and Milan have, in the most high-stakes encounter possible: the 2003 final. The game at Old Trafford could be described as an "intriguing tactical battle," but a more accurate description of the goalless 120 minutes would probably be "tedious." It went to a penalty shootout which didn't reflect particularly well on the takers, with just three of the first eight penalties converted. But then Andriy Shevchenko scored his and Milan took home the trophy.
5) Liverpool vs. Chelsea
For a few years in the late 2000s, it seems as if Liverpool and Chelsea played each other every other week, familiarity breeding simmering contempt between the two sides. The pair first faced each other in the Champions League in 2005, when a 0-0 draw in the first leg of the semifinal set up a fizzing second at Anfield, and the feverish atmosphere was heightened when Luis Garcia was adjudged to have scored what turned out to be the winner despite it not crossing the line. Jose Mourinho fumed for ages about the "ghost goal" and very nearly burst two years later when Liverpool knocked Chelsea out again, at the same stage, this time on penalties after the tie ended 1-1.
4) Milan vs. Inter
The two clubs have won the European Cup/Champions League 10 times, but these two fiercest of rivals have only faced each other twice in the competition. Both ties were pretty dramatic though.
The first was the 2003 semifinal, when an Andriy Shevchenko "away" goal saw Milan win, progressing to the final where they would go on to beat Juventus on penalties. The second, two years later, was dramatic for many other reasons. Milan won the first leg 2-0 and took the lead in the second, through Shevchenko again, but with around 15 minutes to go Inter fans started pelting the pitch with flares, one of which struck Milan goalkeeper Dida on the shoulder. After a 20-minute delay they tried to restart the game, but ultimately it was abandoned and Milan were awarded the tie, and a place in the semifinals.
3) Real Madrid vs. Atletico Madrid
Before 2014, no two teams from the same city had ever met in the Champions League final: now it will have happened twice in three seasons. While Atletico have been better than their rivals domestically in recent years, they have suffered assorted calamities when facing them in Europe.
The most obvious is of course that 2014 final: Atleti went ahead, only for Sergio Ramos to equalise in the last minute, then Real scored three goals in extra-time to win 4-1. That wasn't the first time they had met in the competition though. In 1959, Real were defending their crown and faced Atletico in the semifinals. Real won the first leg 2-1, and Atletico the second 1-0, a result that would have seen them go through today but required a playoff on neutral ground back then. Goals from Alfredo Di Stefano and Ferenc Puskas gave Real a 2-1 win and a place in the final, where they would beat Stade Reims and claim their fourth successive crown.
2) Borussia Dortmund vs. Bayern Munich
In German football there are few more fierce rivals than Bayern Munich and Borussia Dortmund; the latter a team who with their enormous stadium, glittering history and top players would be a giant in most other countries, but are made to look small by the former. The 2013 Champions League final was not the first time these two had met in Europe (Dortmund won 1-0 and drew 0-0 in 1998), but it had the highest stakes. Mario Mandzukic gave Bayern the lead, shortly afterwards Ilkay Gundogan equalised but, with just a minute to go, Arjen Robben tip-toed through the Dortmund defence to win the trophy, and the Treble, for the Bavarians.
1) Barcelona vs. Real Madrid
The ultimate club game would be if Barcelona faced Real Madrid in the Champions League final, yet has never happened. There have, however, been some remarkable Clasico tussles in semifinals. In 2002 when a Steve McManaman lob helped Real to the final where they would beat Bayer Leverkusen; or in 1960 when Real blew their rivals away to reach that great final where they won 7-3 against Eintracht Frankfurt; or the foul-tempered affair in 2011 when Pepe, Jose Mourinho and most bafflingly Barca substitute goalkeeper Jose Pinto were sent off as the Catalans went through.
But perhaps the most notable game between the two was in 1960-61, when Barca became the first ever team to knock Real out of the competition, beating them in the first round of that year's tournament -- 4-3 on aggregate -- and going on to lose the final to Benfica after Madrid had won the first five editions.